I have this problem too, actually.
Haven't given it much thought before but since my server is down, I might just a well inform you of it.
Everything else is working perfectly.
Same as Lazaru5, I have tried to "reinstall" ThorUI, but it doesn't work.
I have not, however, tried to install the original custom preset from the original creator (can't remember his name right now).
Perhaps something you should have a chat with him about, Faetyl? If he's still in the buissness that is
.