MegaSync crashes on "starting" on Windows 11 Build 27802.

[MUsamaSheikh]

MEGAsync.log

Megasync keeps crashing on startup/"starting" in taskbar on loop. I've tried restarting, reinstalling and also installing an older version. Logs attached.

This has started happening after updating Windows 11 to Build 27802, was working fine with previous 27788 build.

No other apps has malfunctioning or crashing.

[vtmateos]

Hi @MUsamaSheikh ,

It seems your version is a Windows 11 Insider Preview Build to the canary channel, there could be issues and problems related to the OS system. I'd recommend you to use the last stable one from microsoft, which if i am not mistaken is 24H2.

Were you able to submit the crash reports through the crash report dialog, or did the app crash before reaching that point?

To help us debug the issue, please contact our support team and provide the crash dump files so we can analyze them. You can find these files at:

C:/Users/usama/AppData/Local/Mega Limited/MEGAsync/crashDumps/

Please send us the most recent .dmp files.

Avoid sharing this type of data on GitHub. It is preferable to contact the helpdesk team directly and send the files to them.

Regards.

[HomerHucho]

I'm also having the same issue, version 24H2 of Windows, fresh Windows install. New PC.

[MUsamaSheikh]

Hi @MUsamaSheikh ,

It seems your version is a Windows 11 Insider Preview Build to the canary channel, there could be issues and problems related to the OS system. I'd recommend you to use the last stable one from microsoft, which if i am not mistaken is 24H2.

Were you able to submit the crash reports through the crash report dialog, or did the app crash before reaching that point?

To help us debug the issue, please contact our support team and provide the crash dump files so we can analyze them. You can find these files at:

C:/Users/usama/AppData/Local/Mega Limited/MEGAsync/crashDumps/

Please send us the most recent .dmp files.

Avoid sharing this type of data on GitHub. It is preferable to contact the helpdesk team directly and send the files to them.

Regards.

The app crashes before i can report it through the crash report dialogue, its on a constant loop, starting and crashing and then starting again in the system tray and creating a new crashdump file everytime. I've also updated it the v5.9.0 and the result is the same. Sending crashdump file to support.

[vtmateos]

Hi there,
Could you paste here the crash stack trace so we can check out?
You can locate at C:\Users<your_user>\AppData\Local\Mega Limited\MEGAsync\crashDumps
Thanks.

[MUsamaSheikh]

MEGAprivate ERROR DUMP
Application: MEGAsync [64 bit]
Version code: 50900.3
Timestamp: 1742222455634
Module name: MEGAsync.exe
Operating system: Windows 10.0.27813
Error info:
Unhandled exception 0xC0000005 at 0x69464(d3d9.dll)
Stacktrace:
#0 0x69464 (d3d9.dll)
#1 0x170B (nvdlistx.dll)
#2 0x1B40 (nvdlistx.dll)
#3 0x10FCF (directxdatabasehelper.dll)
#4 0x17BA3 (directxdatabasehelper.dll)
#5 0x172AF (directxdatabasehelper.dll)
#6 0x59753 (d3d9.dll)
#7 0x58E8D (d3d9.dll)
#8 0x55E9C (d3d9.dll)
#9 0x43AAA (qwindows.dll)
#A 0x4A49 (qwindows.dll)
#B 0x2D6B (qwindows.dll)
#C 0x3F16 (qwindows.dll)
#D 0x3943 (qwindows.dll)
#E 0xD61C (qwindows.dll)
#F 0x4B07D (Qt5Gui.dll)
#10 0x356AD (Qt5Widgets.dll)
#11 0x3501F (Qt5Widgets.dll)
#12 0x480B9 (Qt5Widgets.dll)
#13 0x47FDE (Qt5Widgets.dll)
#14 0x1CCC4A (Qt5Widgets.dll)
#15 0x1CBC01 (Qt5Widgets.dll)
#16 0x29BB26 (MEGAsync.exe)
#17 0x2BF5B6 (MEGAsync.exe)
#18 0x21259B7 (MEGAsync.exe)
#19 0x2122ADE (MEGAsync.exe)
#1A 0x364A7 (KERNEL32.DLL)
#1B 0x7BF0 (ntdll.dll)

[MUsamaSheikh]

Found windows build known issue related to d3d9.dll crash here: https://blogs.windows.com/windows-insider/2025/03/12/announcing-windows-11-insider-preview-build-27813-canary-channel/

I guess the crash is windows related and not Mega app related.

[rautamiekka]

MEGAprivate [...]

Careful pasting, cuz now when you didn't use a code tag, resulting in referencing other, unrelated, tickets.

[rl-mega]

Hi @MUsamaSheikh, your link does point to an issue with Windows...
To continue using megasync, as a temporary workaround, you can try forcing Qt (the framework we use to build megasync) to use a different OpenGL renderer (it seems that in your case it is trying to use d3d9).

• first make sure your graphics drivers are up to date (Qt should use the graphics driver's opengl implementation if available, using d3d9 is a fallback already)
• if nothing changes, you can try setting some environment variables (going from the most preferable solution to last resort):
  • set QT_OPENGL to angle and QT_ANGLE_PLATFORM to d3d11
  • if this fails, try setting QT_OPENGL to angle and QT_ANGLE_PLATFORM to warp
  • if this fails, try setting QT_OPENGL to software

Note: you may need to log out and log in your Windows session for the changes to take effect. Also, setting this will have an effect on all your Qt applications.

Please try this and let us know how it went :)
Have a good day

(I took the liberty of updating you comment above to avoid the link issue reported by @rautamiekka)

[iagogv3]

Here (on Windows 11 Pro 24H2), lastly (last weeks), MEGASync don't crashes (there is nothing at C:\Users<your_user>\AppData\Local\Mega Limited\MEGAsync\crashDumps), but keeps logging in and soon after start (approx. half minute, 1 minute maybe?) displays a message

Any other apps work, sometimes after many hours MEGASync gets connected (!!???), and it behaves in this way independent on WiFi/ethernet connection.

BTW, I mean the same behaviour as here: #53 (comment)