Rob Mad Bob quest is broken, if you steal from him at the beginning of the game and then get the quest to steal his key but it's red, you can't progress... it can't be stolen as it's red because I have been to him earlier, I can't kill him to get it (even though I want to keep him alive actually, I tried it as a last resort) because he is immune too so i'm stuck with a badly broken quest that will never leave my quest log. For a thief play through this is quite bad and immersion breaking when it wasn't documented what would happen earlier on in the play through on this character.

and I can't reload a save early enough because i'm forced to be economical with the 99 save limit, so that character is now dead time for nothing.

So you can't drop that key off at a dropbox now that you have the Rob Mad Bob mission?