Sometimes can happen that you found an enemy spell book, but your imps will not pick up it if there is an owned closed door in the way to the library (or lava because you sold the bridges that were covering it for example). There isn't any kind of message informing about that, simply if you drop the imps close to the enemy spell book, they will do nothing. If you don't realize about there is a closed door for example, you can be confused about why imps doesn't pick up it.
However, there is a message informing when a creature cannot reach the room it needs that was introduced in nightly build r1133, and it is:
"Your creature cannot reach the room it needs"
Will be good to have also meesages for:
- Unconscious bodies:
"Your imps cannot pick up an unconscious body because the way to the prison is blocked"
- Dead bodies:
"Your imps cannot pick up a dead body because the way to the graveyard is blocked"
- Spells:
"Your imps cannot pick up a spell book because the way to the library is blocked"
- Traps:
"Your imps cannot pick up a trap because the way to the workshop is blocked"
- Unfilled traps:
"Your imps cannot fill a trap because the way to the workshop/unfilled trap is blocked"
mefistotelis, can you also add these messages as you did in r1133? Will be very good to inform the player about problems with unreachable rooms.