Ok, this is an odd one. There is a Forum site I frequent.. I CAN "log in"... YET when I try to retrieve any "PM" messages, clicking to go there, throws me back to the "login" screen, and I can NOT "login" HERE, tho i COULD login to the regular Forums!!  Site manager Suggested trying in IE (I use Firefox regularly) and it DID work. Fine, two days later, IT is acting like Firefox did, same error!! Any Idea WHAT is GOING on??
I use "Noscript".. disabled it, same results.
I Run Microsoft Security Essentials.....
I have turned off Malwarebytes, Superantispyware, SpybotS&D etc... none are running in the background that i know of, used MSCONFIG to check...
I run Windows 7..... and the Latest versions of BOTH Browsers..
Windows Firewall IS ON.........

In an unrelated, but MAYBE connected issue.. Blog site I run, the NEW "editor" program there quit working about the same time. I can use their "OLD EDITOR" program, but the new one refuses to fully load, you get a "swirly, that never finishes, no answer back from THEM on any issues on THEIR end...
HELP!!

Also, this started about the time I upgraded to IE 9... could they be interfering with each other?? Firefox is my primary (default)  Browser.Run it in Firefox Safemode from the Programs menu after clearing all cookies and rebooting....same results ? ?Installed Chrome, same results as the other two. Will try your suggestion now....Ok, went into tools/options and dumped all cookies etc... then help, and started in Safe mode.. same issue.

I also have "adblock plus" installed, but disabled it when this started happening as well..... no difference.Well if you've tried all that and 3 browsers i'd suggest it's on their end...

PS...Many Site Managers won't admit they are having issues as they are buried in work.BUMMER!! Ok... My wifes computer, SAME ISSUES! Tried hers while waiting.. so I think you are right!! And it's not on EVERY site I deal with , just these two... Well thanks for trying!  Guess all We can do is "wait for a fix" on their end.....I can check the site from this end if you wish...Oh yeah? Ok... this is the site.. http://www.missouricarry.com/forums/
what other info do you need??

Played around some more, quick tests shutting off Windows Firewall, "No Script" etc, no dice.. Got me stumped... (which is fairly easy, I'm no pro!) Could some "update" setting change have boofed something??

Ok, think I've got this nailed... I rolled back IE to version 8... and the Blog editor now works fine! The Forum deal, it's still acting a bit goofy, BUT I was able to get into where i needed to, although I had to take a roundabout path! The one Button on the SITE still isn't right, BUT, I can access my info via another route. Good enough for now. As to Firefox, did some research.. Version 4 seems to have the same/similar issues... scripting incompatibilities (and other things)  with some sites, and a few other things that don't jive with some programs the last version DID...so, I'm going to Go back to Firefox 3.6.14 tomorrow when i'm not groggy. The Bookmarks is a pain, i've got a zillion of them but we'll figure it out as well. Thanks for looking at this, It did kind of spur me in the right DIRECTION.... I'll let you know if we're 100% back after the rollback tomorrow!
Night all!! 2:22 am... UGH! Ok... IE8 is ok.. Firefox, I went back to 3.6.14.... forwards to 3.6.16... then went FURTHER back to 3.5....... nogo! So, I'll install/run Firefox 4.. hope these guys get their sites compatible, or Mozilla, puts out a fix.. for the others,,, I'll use IE i guess!!! Seems Firefox 4 got pushed out the door a bit early... same goes for IE 9!! That, or a LOT of places, are running WAY BEHIND the "tech curve"!!! Anyway, i'm back is business for the most part. Hope this may help someone else who's been "pulling hair"!! LOL!! Nite all.Actually i believe it's more of the fact that site managers aren't keeping up...
Good to hear you're 1/2 way home...