Not sure how, but my UI reset itself to how I had it 2 months ago : /

[Greyhawk]

Not much you can do now, but on the character select screen you have he option to upload/download your UI settings.
When you do get it how you want it again, you can upload your character data, then if it ever goes wrong again, you just redownload your settings.

This^. I upload mine about once a month actually, because this includes your macros and I change mine often enough, or create new ones. Upload that character and data settings, so you can download them later if you need to once you have everything in its place.