You can set the min amount to 0 gp and it will always pick up every item (be sure it's assigned to every monster). I just reconfirmed with the testers that looting is working. Maybe the prices didn't load at the time.
Karluum dungeon will be fixed in the next client release. I believe some of the obstacles in there might not be added to the webwalker currently.
I'll add slayer helm support for obtaining a new task, and npc-contact spell as well.
As for the message: which monster was currently assigned? It seems to not be able to obtain the requirements (items etc) for that so maybe something is missing. (For bug reports please check the first post on how to report them)