Do NOT have 2.3 AND 2.4 installed and used on the same xbox!
Both will use the same system.bin (config/settings file) and this WILL couse problems.
The file can be deleted from the msdash savegame manager or over ftp.
The folders to delete are:
e:\tdata\0face007
and
e:\udata face007
Backup 2.3 on your computor but do not use both versions as you will encounter problems!