Please check again, it should have a five-digit number after 10.0.

Or just make a screenshot of the file properties of explorer.exe.

There's no registry option for that. Also see the FAQ on the tweaker's website.

As for the failure, what's your version of 7+ Taskbar Tweaker? What's the version of your explorer.exe file?

Great, I'm glad you found and fixed the issue.

The stack trace that you posted looks unrelated to the tweaker. You can see inject.dll in there, but that's only because the tweaker hooks some of the explorer windows, so the messages go through it.

I see another thread on my computer which can be contributed to the tweaker, and it looks like this:

That's the mouse hook thread, and it's only running when one of the mouse-related tweaks is enabled (The "Mouse wheel" section on the upper right corner, and several advanced options).

For a start, try to disable the mouse-related options of the tweaker, and see whether you see any change.

So, my assumption was correct, it's being falsely detected by Symantec as malicious. That's not the first time that it happens, and I've seen Symantec's "ProcHijack" before. Unfortunately, there's not much I can do at this point - a debug build won't help. You need to contact Symantec and request to remove the false positive detection of 7+ Taskbar Tweaker. Meanwhile, if possible, you can add the tweaker's folder to Symantec's whitelist. After the false detection is not in place anymore, re-install the tweaker and it should work properly.

The beta version is very similar to the non-beta one. The only slight differences are the compatibility fixes. One reason I can think of for the behavior you're seeing is a security software, such as an antivirus - perhaps 7+ Taskbar Tweaker is falsely detected as malicious and is being killed. Unfortunately false positives are common for beta versions of 7+ Taskbar Tweaker which are not as popular. Try to add 7+ Taskbar Tweaker to the whitelist of your security software and see whether it solves the problem.

You're probably using Windows 10 version 1709 with the KB4520006 update. The incompatibility was fixed in the beta version of 7+ Taskbar Tweaker. You can get it here.

Please try the newly released v5.8.0.3 beta. It was adapted to the recent changes based on build 19013. I didn't test it thoroughly, but I think I fixed the most incompatibility aspects and most options should work.

Form the logs I can see that you're running build 19008. If v5.8.0.3 doesn't work for you, please update to Windows 10 build 19013.

What about the "Show taskbar buttons on" -> "Taskbar where window is open"? (number 3 on the screenshot)

Is that not what you're looking for?

Of course this will only work assuming you'll also move the 9 programs to the desired monitors. Currently, you can't freely choose which items to display on which taskbars, and have the program windows themselves on different monitors.