Emulator

What's the problem?
I get a "corrupted memory card" error when trying to load Gamecube games. Dolphin does not give the "Writing to memory card A" message and even after formatting, the memory card is not readable.

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
6790

(optional) Dolphin version that does not have the problem:
Problem does not exist on unibody MacBook Core 2 Duo Geforce 9400M.

Problem exists on Mac Pro 1,1 with Radeon X1900 using the same operating system and Dolphin versions. Tried with dual Xeon 5150 and E5320 to no avail. The MacBook has SSE 4.1 while the Mac Pro does not.

Operating system and version:
32-bit or 64-bit:
Mac OS X 10.6.6

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
Tried Zelda: Wind Waker and Twilight Princess.

Build command-line (not on Windows):

Was the ISO a plain dump from disc, compressed and/or scrubbed?
Dump

Please provide any additional information below.