Its probably a bug, But If I can't reproduce it. I can't fix it. And unfortunately, I haven't been able to replicate this behavior. Because my development time is limited, I have to prioritize bugs with clear reproduction steps.
I'll keep this issue open in case others can provide more details or specific steps to help me trigger the issue.
I fixed it, the bug is due to me accidentally pressing Enter in "AutoLoad on Path" while entering the recursive paths in "Column Layouts" dialog. It's causing possible corruption of the dialog/ form.
No I spoke too soon ("My Advanced Tweaks" layout is still broken, but I got "Default" layout to work.)

O.K. I can confirm the problem lies in making a new "Column Layout". If I stick to the "Default" column layout it works, maybe a new Column Layout with "AutoLoad on Path" is causing issues...
Default Layout, when importing from other custom layouts, shows a message box with Chinese characters, so there is some corruption since custom layout allows "AutoLoad on Path" and Default layout does not allow this. I hope I made this clear...