Upgraded from v1rc1 to v1 release a day or so ago and got the garbage screen again after reboot ... Upgraded my mk2 this morning when it arrived - no problems there.

(list 6284, S/N 00299, 4 gig blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)