I am having trouble running COD Black Ops under d2xv6 (base 57) with r411 or 410 running on d2xv6 (base 56). If I launch it from the Homebrew Channel or one of the new forwarders it fails with a 'Disk_SetUSB' failed message. I've tried it with d2x v5 alpha 5 as well with the same results.
I even tried it with rev20/rev21 base 57 with the exact same problem.
Any ideas? I would really like to use the new r410/411 but need COD.
Thanks!
3AM update

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I spent some time checking older versions and I found I had to go all the way back to r355 to get COD black ops working. r374 and r388 crashed when launching COD black ops.
I think I am going to have to stick with r355 for now until this is resolved.