What version are you running currently?If its pre 1.6 you will have issues.  If its 1.6 but not 1.6ST you should upgrade to 1.6ST first, and then upgrade to current.  There are a few documents that you may find helpful.The official one: http://osticket.com/wiki/Upgrade_and_migrationThe one I wrote: (yes the version numbers are different, but the basics are the same.)http://www.tmib.net/upgrading-osticket-1812-current-19rcYou may also find the 1.6 to 1.7 and 1.7 to 1,.8 articles on that same site helpful.