Advanced Frontend Editing

I have been working on a TYPO3 4.4.9 site with feeditadvanced 1.5.0 and TV 1.5.5. I worked on the site for many hours last week through early Wednesday AM, testing various users' abilities to use Feeditadvanced. Early that day I found that the extension did not operate for me, both when logging in to edit on the front end, and when going to File|View in the backend. I tried on the PC with FFox, IE8 and Chrome. At the same time the individual users on Macs using Chrome could use it, though they had dialogue window issues.

Some users report being able to edit this morning, but now they cannot. Macs with Chrome and FFox and PCs with FFox and IE8.

I see some listings in FFox Firebug:
http://after3.org/typo3/ajax.php?_dc=1313432278390&ajaxID=BackendLogin%3A%3AisTimedOut&skipSessionUpdate=1

Params {"login":{"will_time_out":false}}

Headers:
Response Headers
Date Mon, 15 Aug 2011 18:19:09 GMT
Server Apache
X-Powered-By PHP/5.2.15
Expires 0
Cache-Control no-cache, must-revalidate
Pragma no-cache
X-JSON {"login":{"will_time_out":false}}
Last-Modified Mon, 15 Aug 2011 18:19:09 GMT
Keep-Alive timeout=5, max=100
Connection Keep-Alive
Transfer-Encoding chunked
Content-Type application/json; charset=utf-8
Request Headers
Host after3.org
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0
Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip, deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection keep-alive
X-Requested-With XMLHttpRequest
Referer http://after3.org/typo3/backend.php
Cookie PHPSESSID=bfc2963ec08e71e3c346aa4f5f7aaceb; be_typo_user=303562c895b3cf85747407465492ff6c; typo3-login-cookiecheck=true; fe_typo_user=a4af9928f2fd4686d9525a87a4dccfac

Thank you -- Tony