After clicking "Save" in "Save as" file dialog, the dialog disappears but no download is started. Is this a Windows 7 64 bit issue? It works fine in Windows XP.

I am trying to download the iTunes installer for Windows 7 64 bit. I have "Always ask me where to save files" checked in Firefox's download options. Steps to reproduce the problem: 1) In the iTunes download page I click the "Download now" link and Firefox shows me a "Opening iTunes64Setup.exe" dialog with a "Save File" button. 2) I click the "Save File" button. Sometimes the dialog disappears but nothing else happens. Other times I get the Windows 7 "Save as" dialog. 3) I click the "Save" button in the save file dialog (I'm using the default user documents folder). The dialog disappears and nothing happens.

If I uncheck "Always ask me where to save files" then the download works fine. I also have a Windows XP 32 bit with the same configuration where everything works fine which makes me think that this problem only happens in Windows 7 or in the 64 bit version.