I have recently updated to the new version of YIM (2.5.30). Since upgrading I have had problems receiving instant messages when the phone is in the holster.
After some investigation I have found that when content protection is enabled (Options > Security Options > General Settings > Content Protection) the phone refuses to accept any instant messages and signs me out of YIM.
Does anyone have any ideas? At the moment I have had to turn my content protection off, which is not the best solution by far.