I haven't heard of anything like this. When you did the migration up, were you physically at the machine, or was it over a remote connection?
When you did the migration, did you get the step that mentioned upgrading the schema, etc? That's when those packages are entered into the installation.
Either way, you may be able to repair the installation through Add or Remove Programs (or, Programs or Features).
Did you migrate up using RU6a, or did you go straight to RU6 MP2 (11.0.6200)?
(RU - Release Update, replaces MR - Maintenance Release)
sandra