When I try to train using items IE

train str for claw
train str claw

the trainer is no longer recognizing any items I try to barter with.

I tried with about 10 different items and for each one got 'You don't have that.' or 'You cannot afford the cost' (when it tried to use coins instead of the item when I didn't put the 'for' in)

If you cannot reproduce and need a log let me know, but it's just very recently become buggy.