Just recently received my Mega SD, and I'm experiencing some odd behavior:
1. Mega SD fails when attempting to read a ROM - Genesis either displays the ROM title and freezes, or hard resets.
2. Infinite reboot cycle with latest firmware on memory card - does not occur when firmware is not present on memory card.
3. The TMSS is not a solid white when compared to a normal Genesis cart.
The Mega SD does read the memory card, it drops 3 folders into the root directory: "BUP", "CHEATS", and "STATES". Options menu is available as well, just nothing further. I have tested with 2 memory cards as well.
Any information, recommendations, or troubleshooting requests are welcomed.