The customer I was working with came from 5.5.2 to 6.7.2. In 5.5.2 the iw-perl modules are stored in /iw-perl/site/lib/TeamSite. In the later versions of TeamSite (6.1 and above) they are in /iw-perl/vendor/lib/TeamSite. The error being displayed in the error.log was that the perl module iwconflictcheck.ipl called I18N_utils.pm and that did not contain the function iw_locale_2_lang. [..]The customer had both the old /iw-perl/site/lib/TeamSite structure and the new /iw-perl/vendor/lib/TeamSite sturcture. I had the customer shut off the TS services, copy over the custom pm modules they had in the /iw-perl/site/lib/TeamSite/PT folder to the /iw-perl/vendor/lib/TeamSite/PT then rename /iw-perl/site/lib/TeamSite to /iw-perl/site/lib/bad. Once the services were started again, TS used the correct pm modules in the /iw-perl/vendor/lib/TeamSite structure and everything worked.I hope this helps with your upgrade issue.