Optional Destinations Settings In Extensions Module Not Retaining Settings

This has happen twice now. Once on 2-16-12 and again last night 2-20-12. Several extensions ‘Optional Destinations’ settings somehow got changed to other users voicemail automatically, without any input from us. For example, extension 221 was set for default optional destinations settings yesterday, but when we came in this morning, the optional destinations settings were for another users voicemail (ext 227). 12 other extensions ‘Optional Destinations’ somehow all got changed to ext 227 voicemail.
We are running the latest 2.10 distro with all basic upgrades loaded except for the upgrades that were just made available since yesterday.