Ah, well that's unfortunate. I'll see if it's possible to easily replicate after forcing a rebuild of the UI as you mentioned, and if so... back to more narrowing down.

Were you using FNEI by any chance?

Nope, I use What is it really used for? instead.

...Well I tried disable and reenabling ...

Did you just enable LTN Tracker for the first time or did it work before? If it worked before, do you know what changed in the meantime?
Edit: This seems to be another instance of other mods messing with LTNT's UI. Workaround will be in 0.9.5. Ideally, I would figure out which mod is responsible ...

Hello,

I am getting a crash whenever I click on the main button to open the GUI. Seems to be reproducible (each time I've tried to open it, it's crashed, even after waiting a while). Log snippet below, but I can send full logs, mods list, and/or save file if needed. Look forward to truly being able ...

I really like Proposal 4, especially because it would also allow keeping the same toolbar setup that I'm used to whenever I switch worlds - including any changes or updates I make (no more questioning myself - "Wait where did I keep/move these to again?"). The only issue I see with that would be ...