Here's a debug version:

https://www.dropbox.com/s/zg3lchclz7vx5ck/7tt_setup_v5.12.3.1_debug.exe?dl=1

It prints some tracing on initialization and saves them to a log file in the installation folder. Please install it, and once you encounter the issue, send me the log. I have some idea for the reason of the crash, it can happen if one of the functions fail, but I don't know why it would fail.

I looked at the dump. Something went wrong when setting up the initialization hook.

I haven't encountered this problem before, and it's tricky to understand what's going on from the dump because the dump doesn't contain executable sections.

I don't believe that the portable version or file permissions have any effect on this problem, it's more likely that you're just lucky and don't see this problem for now.

What I can do is send you a debug version of the tweaker which prints extra diagnostics. Perhaps it will allow me to understand what's the reason for this problem.

2) Try it, perhaps you'll be able to find a single option responsible for the problem.

And in general, unfortunately I can't do much without being able to reproduce the problem. If you find a way to reproduce it, let me know and I'll investigate it further.

Hi Dennis,

I wasn't able to reproduce the problem. Also, the tweaker doesn't have any start menu related tweaks, so I don't believe that it's related. Do you only see this problem when 7+ Taskbar Tweaker is running? Do you also see it if all options are turned off?

Thank you for the suggestion. Closing as a duplicate of this topic:

https://tweaker.userecho.com/topics/568-delay-in-collapsing-grouped-windows

Making the taskbar too narrow, such that the icons are being cut off, causes the issue that you're describing. You posted two screenshots, and in both the icons were cut off and the taskbar was too narrow. Now it looks like you made it wider to post a screenshot, but it's possible that your taskbar is already in a bad state. Once you made it wide enough for icons not to be cut off, restart explorer and then see whether the issue persists.

According to the screenshot, the problem is what I originally mentioned:

According to your Firefox icon which is cut off a bit, my guess is that you're using the no_width_limit advanced option, and you made your taskbar too narrow. Unlock it and enlarge it just a little bit, so that the icons are not cut off. Let me know if that fixes the problem.

And regarding:

It happens whether or not no_width_limit is enabled.

It's not enough to just disable no_width_limit, because the taskbar might still stay narrow. You need to make sure the option has no effect by making the taskbar wide or by restarting explorer.

OK, that's a start. Do the icons only disappear when the no_width_limit option is enabled? Can you post a fresh screenshot of your taskbar?

See my last reply which is still relevant. I created test builds specifically for you. I can't help without your cooperation and without being able to reproduce the problem.

Yes, try it, it wouldn't hurt. From the code it seems like error 5 is supposed to happen only in case of a crash.

Other things to try:

• If you have other customization programs, turn them off to check whether there's a conflict.
• Try turning off all options (if they are disabled, you can temporarily use a portable version which will have all options turned off). If there's no error in this case, try to enable the options and find which option causes the error.