A family of Microsoft relational database management systems designed for ease of use.
That was my first sentence in my question. Yes, it is split. The back-end resides on a central server and then each user has an individual front-end copy of their own.
Everything was rolling fine, until the simultaneous migration to CITRIX and Office 2007 with the exception of Access Runtime which has remained at v.2002. When this change occurred, we started having intermittent problem when user are in the db for extended periods of time. When they first enter, it behaves perfectly, but after a while it starts to '**** out' resulting in random errors here and there. Sometime this control another time another control?! There doesn't seem to be much logic to the problems.