The issue is now resolved.

Theres several major flaws in the design (even more in the execution of the design) of the engine. The really obvious and most retarded is grouping the prices to the second decimal place [this was alleviated to those aware with special api call after my conversation with Nejc, but certainly not fixed] and charging 0.01 usd for each order [thats potentially hiding behind the grouped price], resulting in cases where you pay more for the fee than the traded amount was worth, resulting in negative balance (which mathematically means trading fee varies from 0.4%, across 100%, over to infinity and beyond). Not even mentioning they use ceil().

There is a deeper rounding issue present also, read about it here: http://log.bitcoin-assets.com/?date=16-05-2013&display=show&bots=true#33425 (from 03:08:39 to 03:16:45).

Then you have issues such as bid>ask which only someone with iq below 80 (and im being generous) can come up with. There is two more bugs that come to mind at the moment, one was discussed on the forums and was  'fixed' after a while IIRC, go search, and the other is a bit hard to reproduce (happened to me only once or twice but I got a confirm from other traders).

So its not "Bitstamp is POTENTIALLY stealing BTC from customers!!!! BE WARNED!" but they have been stealing from your stupid faces for a long time (this is years now, i remember it like yesterday when they started and were K-LINED on freenode for being spammy fucks) - lucky for them, bitcoiners are mostly retarded.

But hey, not to worry, theres about 10-30 idiots trying to open 'another bitstamp' [yes I am quoting] so is all good, right!?