Hi, I'm not sure that this is the same bug or a newer version of this bug posted last year:
Basically, there are a couple of things that seem to cause this problem for me while in the Choose Toolbox Items dialogue. When it happens, nothing can be done to escape the dialogue and the program becomes unusable. Its process must be manually taskkilled for the program to exit. Also if it matters, the dialogue's graphical elements become mangled and corrupted after the bug. I can post a video or more information if needed. As for my setup, I don't think my installation is anything out of the ordinary. I don't even use any addons or plugins.