That's not great. You're on 0.6.22b, right? I had a bug in 0.6.22 that caused the Overwrite button on savegames to not properly update, and it would lock the screen... sounds like that could be it.
If that's not the case, let me know your platform, and I'll see if I can pass you an updated build to fix it.
Could you also get me the savegame and the player.log file? They're here
PC: %USERPROFILE%/AppData/LocalLow/Droid Productions/Love of Magic OSX: ~/Library/Application Support/Droid Productions/Love of Magic Linux: $XDG_CONFIG_HOME/unity3d/Droid Productions/Love of Magic
