I got the exact same thing on startup,possibly the automatic updates from yesterday (I hope you can find out what was in the 2-3 rd Feb update on Edgy) causing it ? as I have installed no new software or made any changes in the past few days.
Bug report attached Jeff ** Attachment added: "Mono Craash Report" http://librarian.launchpad.net/6187995/_usr_bin_mono.1000.crash -- Mono: Crash message on startup https://launchpad.net/bugs/82824 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs