First, you could try reinstalling the game, to see if the problem goes away. (On rare occasions, the game files can become corrupted. This is not specific to The Quest, that's just something which can happen on any computer/device). Just save your save files using iTunes File Sharing (
http://support.apple.com/kb/ht4094), delete the game, then redownload it. After you've reinstalled it, enable any expansions which were enabled, then copy back the save files.
If the problem remains, this might be a bug in the expansion quests/scripting. Unfortunately, I can't help you with that, but you can try getting help either here on the expansion forums or at the forums at Zarista Game's site (see the link in the other expansions subforum).
The floating skeleton sounds like it might be an engine bug, though. If you could send us a save file, as near as possible to the problem, I might be able to correct it. Please include directions on exactly what to do to trigger the bug. Our address:
redshift@redshift.hu