Firefox NoScript effects on Private Messages
For the past couple of days, I thought I was losing my marbles... some PMs that I'd attempt to send wouldn't get sent and wouldn't appear in my sent box or when I'd attempt to post a message I'd get "Invalid Thread" message. I believe the issue is caused by the latest update (18.104.22.168) to the NoScript plug-in for Firefox.
Upon sending a PM for example, I noticed a little popdown message from NoScript that says it filtered a cross-site scripting attempt from an untrusted origin. The popdown is pretty small and doesn't appear until the next page is fully loaded so I missed it a couple times. The technical details appear in the Console window for NoScript.
The fix is to open up NoScript's options, choosing Advanced and unchecking "Turn cross-site POST requests into data-less GET requests" (which is checked by default).
Just thought I'd share.