I'm having the exact same issue as yours and filed a bug about this issue: https://bugs.maemo.org/show_bug.cgi?id=11559 , asked about it (at least ten times) on #maemo and created a Talk thread long time ago.

Looks like it's kind of a known issue.
http://talk.maemo.org/showthread.php?t=67473
http://talk.maemo.org/showthread.php?t=68307

I also need help about it. I tried to use (without any experience) strace and dbus-monitor to see which files are loaded when I start Conversations app and failed to do that correctly :|