If you think you have found a bug, please report it.
Please start by posting a description in the Quality and Testing Forum for the release. This will allow others to see if the problem can be reproduced.
Before reporting a bug to the issue tracker, we strongly recommend reading How to Test and Report
To report a bug using the tracker you need to register at joomlacode.org.
For bugs in the 1.5 series, please file the report here: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemBrowse&tracker_id=32