Well, I'm stumped: the obvious suspects are the Intellipoint software (unlikely considering how many people must use it), a bad install (always possible - have you tried running the installers again? they should remove the "old" versions as part of the install, and you shouldn't suffer any content loss) or a fault in the version on the servers. Are you working in the same scene all the time, or have you tried a new scene or a close and restart for D|S?