If you're using the
[Only registered and activated users can see links. Click Here To Register...] for the shen1l itemmall release then you'll get auction board bugs from what I've personally experienced when testing it.
The issues I saw were "Vault Auction has been opened." notice spamming when you'd open the board or switch to a new tab and then the board becoming unusable after navigating to the 'Interested Items' tab.
I'm personally a fan of removing the itemmall altogether and using the giftbox instead, (which can be done with
[Only registered and activated users can see links. Click Here To Register...]) so I never tried to fix the problems, but as SnickQ mentioned it's most likely the use of the ep4 ps_dbAgent causing problems.