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Running Windows 7 & Firefox 12 with Adblock Plus disabled.
You did the right thing: disable script-blocking, dump your cache and refresh the page.
However I did have to change my antivirus a few days ago as the one I was running was causing problems, the AVG "Do Not Track" I installed with AVG anti-virus seemed to be causing the problem as everything works fine as soon as I disable it.
There is a known problem associated with members who have selected a large number of favorites. Essentially you've maxed out on what is allowed.
This problem has been given to the programmers to work on as soon as they are able to.
In the mean time, you may be able to "un-fave" some Instructables (if you don't need them anymore) which should allow you add others.
See comment by StumpChunkman.
Since I made the changes to Adblock Plus & AVG Do Not Track I have not had a problem.
Thanks for the suggestion though.
In the other report, the favorite button disappeared after the member had selected 80 favorites...
If you're looking to favorite something, it's a little red heart at the very top right of an instructable. :)