I have a couple of ProfessionBuddy profiles downloaded from here which if you don't have mining pick it buys one for you, I've manaually corrected the logic in the profile as it was doing an Item ID cehck for mining pick only not the Gnomish knife. this is a fault with the person who wrote the profile, not HB it's self. I would recommend contacting the owner of the profile you are using and asking them to check their logic. Or like myself I just updated the profile code myself.