Closing due to a lack of feedback. Feel free to leave a comment if there's still a problem.

Please update 7+ Taskbar Tweaker to the latest version, 5.10. That should fix the problem. Let me know if it doesn't.

Please update 7+ Taskbar Tweaker to the latest version, 5.10.

There's no version 5.1.9, did you mean 5.9.1? The latest version is 5.10, please update.

Please make sure that you're using the latest tweaker version. If that doesn't solve the problem, please provide your tweaker version, the version of your explorer.exe file, and the exact error message that you're getting.

Fixed in v5.10.

Changed in v5.10 per your suggestion, thanks.

Fixed in v5.10.