I searched the sent-mail and the web logs showed:
[21/Feb/2012:18:36:11 +0100] "GET 
/?_task=mail&_action=preview&_uid=4628&_mbox=INBOX&_framed=1 HTTP/1.1" 200 3010 
 "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0)"
[21/Feb/2012:18:36:48 +0100] "GET 
/?_task=mail&_action=check-recent&_mbox=INBOX&_list=1&_quota=1&_remote=1&_unlock=0&_=1329845903358
 HTTP/1.1" 200 710  "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; 
Trident/5.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322; 
.NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C)"
[21/Feb/2012:18:36:50 +0100] "GET /?_task=mail&_err=session HTTP/1.1" 200 4114 
"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0)"

This are the logs from one single user using the same browser (IE9). First 
request used one User-Agent strings, the second one (command check-recent) used 
different one and the third (error; aborted session) used first one again.

As we explored the issue, we found out that auto-detecting compatibility mode 
in IE is causing troubles and since the TRAC ticket (#1487838) said that the 
issue is fixed, we thought the problem was in our localized theme and we added 
X-UA-Compatible head section and fixed the issue in that way. I don't know 
whether the same thing happen with default skin, so I cannot generalize that 
the problem actually exist in the recent RC version.

cheers, J.

On Apr 20, 2012, at 7:51 PM, Reindl Harald wrote:

> 
> 
> Am 20.04.2012 19:35, schrieb A.L.E.C:
>> On 04/20/2012 06:45 PM, A.L.E.C wrote:
>> 
>>> To OP, you could try to remove .$_SESSION['HTTP_USER_AGENT'] from
>>> rcmail::session_configure() or better find what causes user-agent string
>>> change if it happens here.
>> 
>> Another and probably better solution is to add
>> 
>> header('X-UA-Compatible: IE=edge,chrome=1');
>> on top of the index.php file.
> 
> would it not be a good idea to do this upstream?
> 
> i have made this line on our setup now after
> followin the thread - not knowing about user
> problems currently but they are mostly saying
> not a single word over months if things are
> going wrong :-(
> 
> 
> _______________________________________________
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> users@lists.roundcube.net
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