As of the latest
patch, True Shot and the damage portion of Crossbow Expertise are broke.
Some people have run into problems with Aura of Command causing a crash after having worked for a portion of the game, which in a couple cases started working again later. A few people have had Repair cause crashes with equipped items, but found that it worked reliably with items on the ground or in the inventory. A couple of people have had problems with traps, summoned and resurrected creatures turning hostile, possibly in connection with mixing these. Many people have used these skill without incident.