Japanese forex broker GMO Gaika has acknowledged a technical problem preventing its 外貨ex for Windows trading application from launching on certain customers’ computers, with a software fix targeted for November 28, 2026.
In a November 13 announcement, the broker confirmed that the application fails to start under some Windows configurations. GMO Gaika said it had identified the underlying cause and was working to resolve the problem by Saturday, November 28, but did not disclose the technical fault or specify how many customers were affected.
The company has instructed affected traders to use its browser-based trading platform or the 外貨ex smartphone application while repairs continue. Both alternatives allow customers to access their accounts, check existing positions and execute trades without relying on the Windows desktop program.
The update, though, gives a date without much technical detail. GMO Gaika has not disclosed when the malfunction first appeared, whether it affects particular Windows versions or whether customers experienced failed attempts to close positions before switching to alternative platforms.
Windows security settings may affect application startup
The broker’s announcement identifies differences in customers’ Windows environments and device settings as factors associated with the launch failures. It does not identify a particular Windows update, application component or software dependency as responsible for the problem.
Some Windows PCs just will not open the application. GMO Gaika has confirmed that the issue affects only certain configurations rather than every installation of 外貨ex for Windows.
The company also issued an explicit warning against modifying Windows security protections to make the application run.
According to GMO Gaika, changing settings associated with Windows protection features, including Smart App Control, might allow the program to launch. The broker nevertheless advises against that approach because some changes cannot be easily reversed and could reduce the computer’s overall security protection.
Microsoft’s Smart App Control is designed to restrict potentially unsafe or untrusted applications. Depending on the operating system’s configuration, disabling the feature can require a Windows reset or reinstallation before it can be enabled again.
That leaves affected customers with a practical restriction: they are being asked to use a seperate trading interface rather than alter security controls on their devices.
GMO Gaika’s published technical requirements specify Windows 11 version 22H2 or later, a 64-bit operating system, at least 4GB of memory and a processor comparable to an Intel Core i3. The broker has not established whether the startup failures are concentrated among customers using any particular supported configuration.
October software update predates the reported problem
The launch issue follows a previous update to GMO Gaika’s Windows trading software, although the company has not connected the two developments.
The broker’s application release history shows that version 3.4.0 of 外貨ex for Windows was released on October 17, 2026. Its release notes describe the changes only as minor corrections, without identifying individual bug fixes or modifications to the application’s compatibility with Windows security features.
A notice issued on October 16 also stated that the October 17 maintenance period would include mandatory updates for several trading applications, including 外貨ex for Windows.
The October update is documented; a causal link is not. Neither the November 13 announcement nor the release notes establish that version 3.4.0 introduced the current malfunction.
GMO Gaika has not disclosed whether the planned repair will be delivered through an automatic application update, a new installer or another technical process. Its latest release history does not identify a subsequent Windows version containing the fix.
The distinction between a planned software transition and an unexpected failure is relevant to traders who depend on desktop platforms. In Japan, OANDA Japan previously announced restrictions on new MetaTrader 4 orders ahead of the platform’s retirement, giving customers a defined transition schedule. GMO Gaika’s current problem instead concerns an existing application that some customers cannot launch.
Alternative trading platforms remain available
GMO Gaika has directed customers experiencing the Windows startup issue to its browser platform and mobile application for transactions, account monitoring and closing open positions.
The trading route is still there, only on another screen. The broker has not reported a general shutdown of its FX execution infrastructure or suggested that customers using unaffected applications cannot trade normally.
This differs from incidents involving the actual processing of trading instructions. For example, CMC Markets reported a 65-minute order-processing disruption on October 1, during which intermittent technical difficulties could affect how customer orders were handled.
GMO Gaika’s disclosure identifies a client-application startup failure rather than a confirmed server-side execution problem. No evidence has been published showing that the malfunction resulted in rejected orders, incorrect executions or customer trading losses.
The availability of the browser and mobile alternatives provides affected customers with other methods of managing their exposure. Nevertheless, customers using Windows-specific chart arrangements or desktop workflows may need to adapt their trading processes until the application becomes functional again.
The broker has not confirmed whether all features available in the Windows application can be replicated through the alternative platforms.
Other forex brokers have faced disputes involving access to trading accounts during technical incidents. DaveFinances previously examined customer allegations of trading interruptions at Capital.com, where users questioned whether technical problems had affected their ability to manage accounts and transactions. Those complaints were separate from GMO Gaika’s confirmed application problem.
November 28 repair target and regulatory obligations
Japan’s Financial Services Agency maintains supervisory requirements for financial instruments businesses covering computer system reliability, incident response and customer access during technical failures.
Under the regulator’s supervisory guidelines for financial instruments business operators, firms are expected to identify system failures, restore affected services promptly and provide customers with appropriate information about disruptions and recovery arrangements.
The guidelines also address reporting requirements for computer system problems that affect trading activity, settlement or customer convenience. Certain disruptions may fall outside the reporting requirement when an effective backup system prevents an adverse impact.
GMO Gaika has not disclosed whether it submitted a regulatory incident report concerning the Windows application. The public announcement does not provide sufficient information to determine whether the malfunction meets the relevant reporting threshold.
Separately, the broker scheduled routine system maintenance for November 14, between 9:00 a.m. and 1:00 p.m. Japan time, during which trading-screen logins and other services were to be unavailable. That maintenance was announced independently of the Windows startup problem, and no common technical cause has been established.
The November 28 repair deadline remains a target rather than a confirmed completion date. GMO Gaika said it would publish another notice on its official website once the corrections were completed.
For customers, there is an alternative route for trading now, but the normal Windows application still needs repairing. The broker has not published the number of affected users, the date the malfunction began or a detailed explanation of its root cause.
Those missing details also limit an assessment of the incident’s operational and financial impact. There is no disclosed estimate of customer losses, compensation obligations or revenue effects associated with the application failure.
GMO Gaika’s immediate committment is to restore the desktop application by November 28 while maintaining access through its other trading channels. A subsequent software release and confirmation that affected Windows configurations can launch the application normally will establish whether the broker has met that deadline.
Johan Shamshad is Editor-in-Chief at Dave Finances, covering financial markets, digital assets, trading platforms, brokers, fintech, payments and regulation. Since 2023, he has also worked as an editor at Gulf News, the UAE English-language newspaper published by Al Nisr Publishing LLC. His work focuses on market-moving developments, company disclosures, regulatory changes and trading infrastructure, with an emphasis on primary-source verification and practical context for traders and investors.