FireFox 3.5.6 fails to start after update through update manager

Err, just to confirm, is this the same as the following discussion on the forum?

http://ubuntuforums.org/showthread.php?t=1359850

(Just wondering b/c only one report so far)

That is not quite what I am experiencing, as I don't get any window to come up at all and I have tried all the things suggested there. Sorry I wasn't clear. I moved .mozilla out of my home folder which includes both ./mozilla/firefox and ./mozilla/plugins. Also, I tried rebooting my computer and that didn't help.

Just to add to this:

I tried running firefox --debug and there are no errors within GDB and it gets this far:

matt@matt-desktop:~$ firefox --debug
/usr/bin/gdb /usr/lib/firefox-3.5.6/firefox -x /tmp/mozargs.okUqHw
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/lib/firefox-3.5.6/firefox...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/lib/firefox-3.5.6/firefox
[Thread debugging using libthread_db enabled]

In system monitor it says that the waiting channel is "futex_wait_queue_me"

Okay, so apparently Firefox doesn't like running in an NX session after first being updated (i.e. I get it to work if I run it in vnc first). How irritating...

Looks like I was experiencing http://ubuntuforums.org/showthread.php?p=8481913, and I just happened to update firefox & start using NX with the specific problem settings at the same time because I'm on Vacation. This can be closed.