User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_6; en-us) AppleWebKit/525.27.1 (KHTML, like Gecko) Version/3.2.1 Safari/525.27.1 Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1b3pre) Gecko/20081223 Shredder/3.0b2pre When customising the toolbar in the write new email dialog, a blank dialog appears with no buttons or no icons. It is impossible to close the dialog without quitting Thunderbird and reloading. You can however successfully customise the toolbar in the maini window Reproducible: Always Steps to Reproduce: 1. Click create a new message 2. Click view->toolbars->customise Actual Results: Blank dialog appears. Cannot customise the toolbar Expected Results: Load the appropriate icons to enable you to customise the toolbar

Last time I tried you could select view -> toolbars -> customise a second time and it would bring the dialog up properly. Either way this should be fixed soon - the fix in bug 468991 and we should pick it up when it lands on the 1.9.1 branch.