If you tried it in that many boards and had the same problem with all of them I would suggest the MOTU card was somewhat faulty. It is highly unlikely you would have conflict with that many. The common denominator is the usually the problem with PCs (ie the MOTU card).
And I've been a computer professional for going on 15 years, I know what I'm doing
With the PCI 324 there are problems with more than just VIA chipsets. Motu really had a poor design on that one. There was also problems with different types of RAM as well according to MOTU tech support. It really was not a VIA problem in specific. There was a much larger problem due to MOTU. At least according to MOTU's tech support that is.