I'm running the latest 1418 build in Firefox on Windows Vista

Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv: Gecko/2008072406 Prism (zdesktop/0.92)

My problem, is that I use keyboard shortcuts extensively and they seem to have become a little flakey since I upgraded. Specifically:

When composing a message, I usually attach a file by using the ctrl-q combination. However, when doing this with the 1418 build the button combo seems to cause the entire application to close down.

I would appreciate if someone could point me in the direction with regards to resolving/reporting this issue.