I've come across an issue in CRM 2011 where you get an error when you use the custom filter on a pick list attribute, when the pick list contains an & sign. We have regions, such as NZ & Pacific, and I don't really want to change to an 'and' because of what looks like a bug.
Has anyone else had this problem? We've just applied Rollup 11 and it doesn't seem to have fixed it.