@Motty Katan - I checked the error console. A whole bunch of warnings come up, but nothing specific is triggered by clicking on Attach at the top. The issue is reproducible by clicking the Attach button at the top (between Send and Save Draft), WITHOUT having the Yahoo Java plug-in installed (basically, old-style attachment), on Firefox 3.5.3. Motty, if you want to send me a test version, I'd be willing to help you fix this problem. <p>@Motty Katan - I checked the error console. A whole bunch of warnings come up, but nothing specific is triggered by clicking on Attach at the top.</p> <p>The issue is reproducible by clicking the Attach button at the top (between Send and Save Draft), WITHOUT having the Yahoo Java plug-in installed (basically, old-style attachment), on Firefox 3.5.3.</p> <p>Motty, if you want to send me a test version, I'd be willing to help you fix this problem.</p> 2009-10-04T18:50:42Z 3115 Script 176072 34098 2009-10-04T18:52:16Z Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729) 28641