Elements of Fixer theme not saving out

Hi - I had a similar ticket open but have not received a response in over 24 hours, so figured I'd open a new one. I am having issues with edits to my Fixer themed website saving out properly. It seems like some of the oldest items will save (for instance, my header is now saving properly, which is the first thing I edited), but the most recent edits do not save, they just revert back to their default. I have wasted a lot of time on lost work already, so really would like some help before I try saving out again!