Not sure why, but the monk in my second slot, a redhead in green robes whom I have decided is Irish, periodically stops doing anything. Won’t attack enemies in range, won’t heal allies in range, just stands there like a lump while Everybody else tries to pick up the slack. Changing his targeting rules made no difference, changing his preference from regular to attacks or healing didn’t make a difference, recalling him and summoning him again didn’t even help. Not sure what the heck to do on that one.
I’ve noticed that sometimes my Dragon does similar, but only with her fire breath that I’ve noticed. She’ll sit there with her skills full and ready to go and ignore enemies walking through her range.
Edit: Using Windows 7 and Game is Steam version 1.0.51