If you are noticing session problems such as the following

 "When I enable the plugin for caching in the plugins menu, the bridge does not stay logged in between sessions even if "remember me" is checked; if I close my browser and reopen it, I come up as logged out.

Also, other users report that when they go to the site (while that plugin is enabled) they show as logged in as me."

Please upgrade to Joomla 1.5.4 or later.  This seems to be a Joomla problem that was fixed in the mentioned release.