After enabling Skype within Trillian, my Skype Voice Mail stopped working.  Disabling Skype in Trillian and Voice Mail works again.  It looks like Trillian has had this issue since February 2012 (version 5.1 build 18 per this post).  I’m running version 5.3 build 16 (June 2013) and the issue still exists.  Both Skype and Trillian are great—I hope this issue gets resolved.