I also had the issue wherein any attempts to edit my plate or profile would not be saved. After staying online for hours, changing areas, editing one thing at a time, nothing worked. However, once I set a search comment on myself (I previously had none), I was able to make changes that would actually save. I could even remove the search comment afterward and make further changes without issue. Seems like some characters have some sort of null data that is messing with the save and it's just not providing feedback on it.