This should be filed under Troubleshooting.
Paste your OS, arch, version of GPP (i.e. GPP1, etc), and contents of admin.dat
It's highly likely that your admin flags are messed up, but without knowing the details of your situation it's impossible to tell.
CentOS 5.6 i386, GPP1 (whatever was in the Files section last week). I did compile tremded-gpp.x86 from the source provided with tremulous-gpp1.zip; whoever is compiling these is not taking into account systems that don't have the latest glibc 2.7.
[level]
level = 5
name = ^1Server Owner
flags = *
[level]
level = 4
name = ^6Operator
flags = iahDC P1Be7 ckbm4 VpNKdn3r5y lxsG
[level]
level = 3
name = ^5Moderator
flags = iahDC P1Be7 ckbm4 VpNKdn3r5y
[level]
level = 2
name = ^4New Moderator
flags = iahDC P1Be7 ckbm4
[level]
level = 1
name = ^2V.I.P.
flags = iahC P1Be7 35
[level]
level = 0
name = ^7Player
flags = iahC
[admin]
name = supertanker
guid = FDSFDSFSTKW(*TUW$)(IUT)(TKDSFGDFGDD
level = 5
flags =