OK, so this is really weird. I'm running this GREP to add space between closing quote marks/apostrophes and footnotes.
Find:
(~])(~F)
Change:
~]~|$2
This works great when I change them one by one, but when I hit the 'change all' button it just deletes all the found footnotes! I have hundreds of footnotes to change so any help would be much appreciated as I don't really want to change them one at a time when this should be unnecessary.