you will lose ALL keys from the previous Act when you advance to the next Act...
Just curious... Does everybody else loose all keys (I don't know about BF keys, since I never pick them up in the first place, but normal keys?).
I never lost a key during an act change. And I SHOULD be loosing them, since those keys I didn't use in the previous act seem to enable me to open chests/doors in the next act without the proper key...
