Yes, I tried converting a copy of a 2012 tree that previously wouldn't sync. I converted without creating a member tree. Then I requested an upload to ancestry, private tree, manual sync, not indexed. It said it completed although the status indicators still said not synced. I clicked on view tree and it went belly-up.
Started it up again. Status of tree in FTM 2014 is "updating" although the media never loaded. The tree is up on Ancestry and it thinks it is sync'd although 2014 doesn't really have its act together and doesn't recognise it. Compacted the file and tried to sync but FTM doesn't recognise that it is sync'd even though Ancestry says it is.
Vista 32-bit Home Premium
FTM 2014 build 184.108.40.206
So, back to 2012 again.