We fixed a bug where some of your typing could be undone when you used "cut" (Ctrl+X). 
You will no longer see empty or deleted categories among the suggestions when you add a category. 
Future software changes
The latest version of MediaWiki (1.24wmf19) is on test wikis and MediaWiki.org since August 28. It will be on non-Wikipedia wikis on September 2, and on all Wikipedias on September 4 (calendar).
There is a proposal to build a database on Commons for file data. It will make it easier to see the author, license and topics. You can give feedback on this idea. You can also come to the IRC chat on September 3 at 18:00 (UTC) in #wikimedia-office at freenode. 
You can give feedback on Media Viewer until September 7. You can say what needs to be improved and ask other people to give feedback too.