Okay, sounds like you haven't uploaded all the new cgi files. cookie-lib.pl hasn't been required since 5.43 IIRC. Which means one or more of the old UBB files are haven't been replaced in the upgrade. You'll want to recheck that you uploaded ALL the cgi files in the upgrade zip EXCEPT FOR THE FOUR VARIABLES files (although they shouldn't be in the zip anyway).

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Doug
darksaber.hispeed.com
I am altering the deal. Pray I don't alter it any further.
--Darth Vader, The Empire Strikes Back