hi Mikez and welcome to the forums!

how much graphics memory is on the board? remember... when you are using multiple wows, take the amount of memory you have and divide by the number of wows you want to run. ie: 256M running 3 wows... this means each wow only has ~85M each. sounds like enough, but it could be an issue when you get to busy areas.

don't get me wrong, i don't think that would cause that effect... that just looks like a driver or the card is wonky (could be the memory on the board having issues as well)

good luck