My opinion?

If you ever hack your board again, I will hurt you. <img src="https://www.ubbcentral.com/boards/images/graemlins/laugh.gif" alt="" />

Okay... first off, whoever told you to nuke the .cgi files is probably right on.

Delete the cp_* files, the ubb_* files, the vars_* files, cp.cgi and ultimatebb.cgi.

Delete your Templates directory.

Delete anything in your Members directory that isn't a directory or a file ending in .cgi.

Make a clean, fresh, new install straight from the 6.1.0.2 zip file.

Make sure the Members directory has the member_test.cgi file and the last_number.cgi file.

Make sure all the files that the zip has in the noncgi directory really are there.

That should avoid the cp.cgi login loop.

--
Charles Capps
Programmer, Infopop Corporation
Please do not contact me privately for support - post on the board or open a support ticket instead!