I reinstalled from the CD, ran the pbsetup.exe, then entered a Novalogic owned server and used the pb_security 0 command.
That seemed to work on any non IC mod maps. But I cannot find any IC 4.1.7 maps.
Ghillie, when will the GS server be up?
[EDIT TO ADD]
Ghillie got the server up with the new mod, and I was able to play, after using the pb_security 0 one more time. This command apparently forces the local PB to update to the connected server's version of PB. So be sure to run this command ASAP once in Ghillie School.