I had this problem when I was upgrading to SQL and had no easy way to access the DB through my ISP. I uploaded the file 'mod_dbsetup.asp' from the previous version of Snitz then used the following script:
Admin Level MOD FIX (Default)
[ALTER]
MEMBERS
ADD#M_ALEVEL#int#NULL#3
[END]
[UPDATE]
MEMBERS
M_ALEVEL#1#M_LEVEL=3
[END]
saved as a .dbs file. Uploaded it and accessed mod_dbsetup.asp directly in my browser. Ran the mod and I was able to get back in to Admin options. Remember to delete both files off your web server when finished. Quick and dirty way of fixing it probably.