Speaking of ethernet issues.. My new mk2a doesn't get along with my old Linksys 5-port 10/100 hub -- the hub refuses to forward frames to/from it to the other (newer Linksys 8-port, works great!) hub I have. Oddly enough, my Mk2 has no such issue, though.

Anyway, I just swapped out the pair of hubs for a new 16-port Nway switch (needed more ports anyway; only one left on the new setup..).
What'cha connected to?