Yes, I've used GParted all along. As I mentioned previously, flopswap works flawlessly with my other cards, so obviously I would understand the centrality of partitioning.

In any case, since you and others have been able to use the SanDisk 64gb without running through hoops, I am beginning to suspect that the culprit is likely the card itself. With the 64gb card installed, I experienced 4 or 5 random reboots a day with swap enabled on the card. The reboots stopped when I switched back to the 32gb card (again with swap enabled on the card).

Android_808 - How often do you see random reboots? I almost never get them, even with heavy load, even with the dsp profile loaded