Yep, Qwix refusing to transfer files to the G partition is one of the symptoms.
If you can start from scratch with a clean C that would be far better (but with the usual cautionary note about making sure you have a copy of you eeprom first in case anything goes wrong!) There are lots of ways you could do it, I'd do it in three stages:
- Copy the Krayzie 1.1.1 gamesave to the Xbox and run the exploit to give basic access, but don't install the softmod
- backup the eeprom, then FTP to the Xbox , copy the eeprom backup to your PC, and replace the C partition with a complete set of clean dash files from Slayers or CASH.
- Reboot the Xbox, run the exploit again, and install the softmod.
Whatever you decide to do, once the box is softmodded again it's exactly as you said - just copy XBPartitioner1.1 to your Xbox, use it to reformat G, and start again.