Delete 1-2 save files for the system your playing, I guess Sega Genesis? Try to see if you can play/save games again at that point.
I think there are some orphan files hanging around that eat up space that we still haven't perfected. For example, I know if you delete a ROM from the library the save file stays on the system, even if you uninstall Hakchi (maybe not if you do a factory restore as well?). I did a full uninstall / install before upgrading the library from uncompressed to compressed games. Not sure if this helped or not, but it definitely seems to be running very stable now. I even added a few more games, and didn't hit any issues other than one game that refused to work with even new save states when compressed (really strange, anyone else seen this?!?)
I'm still not clear what the 30 MB limitation includes. Originally I thought it was folders, now I think it is packets for sending data across during the transmission. And honesetly, I am not sure if it still an issue or not?!? Nothing in Hakchi warns about it... There is definitely a limitation to the total combination of save states / games in a folder. However, it is not clear to me whether that is also limited by MB as well.
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No, snes9x2010 is the default. You would need to install both the snes9x2005 modification and the use_snes9x2005 modification to force it. Alternatively you can change the parameters, to force launching by changing it from /snes to /snes05 (once snes9x2005 is installed).