You might end up having to move back one version if the latest is seeing a problem since that is newer then seen on the original disk. I've run into that a few times where the latest is the problem usually being too new for an older model however.
Ramscrub itself is in the same catagory as memtest or tarball being a memory tester. The newer catalysts are likely now seeing that added in them over the cats for the older series of cards like not seeing that with the 2600 here or with a 3870 but now seen with the 4xxxx models.
Does this look familiar to what you are seeing there when coming out of standby?