First of all, I don't mean to flood, and apologies for resurrecting a locked thread.
Second of all, thanks to everyone who offered help - much appreciated.
Third, I followed all the steps suggested from scratch, in this order:
1. Uninstalled the script, then uninstalled Greasemonkey;
2. Cleared cache/cookies from browser;
3. Restarted computer;
4. Installed newest version of Flash;
5. Restarted Firefox;
6. Reinstalled Greasemonkey and script.
These steps produced the same problem as before, so I followed steps 1 - 5 again, this time installing the alternative script instead of the Oontack script.
At first this looked like a promising solution, with the specialties/super/pets bulletin intact below the script:
However, the same problem occurred when I attempted to use the script:
No specialties, supers, pets or weapons.
I'm guessing nobody has seen this problem, but if anyone has any ideas, I would be very grateful. Thanks for your time.