More info: I tried the following:
- Re-downloaded the community file as Mega Man 2 community.3dn
- Copied and pasted the rom as Mega Man 2 community.nes
- Loaded that rom. The community file loads fine.
- When I load my original work, it is rejected and the game appears to be default, as I described earlier.
- Then, when I load the same community file again, it too fails and the game reverts to default!
What is happening!?