I'm not at all sure if this is related, but possible...!
Yesterday an admin had a problem when adding data to the cms - he had added content in the morning with no problem.
When he tried to add and submit content an hour later it prompted him for his login details which he entered, but then he wasn't able to see the page he'd just created.
He checked adminlog - it was recorded here, went to go back to view the 'pages' and the entire screen was blank - and still is whenever he logs in. All other cms content loads fine.
I then tried to find his page, clicked on 'expand all' to view all pages and promptly go an error 'invalid xml returned from the server' - the pages screen went blank and still is.
Other users are able to login and see content under the pages tab. Myself and the admin cannot!
I checked the log yesterday and it returned a fatal error around the time the admin had the issue - as follows:
[Thu Sep 10 14:24:46 2009] [error] [client 62.225.34.137] PHP Fatal error: Allowed memory size of 64000000 bytes exhausted (tried to allocate 4927172 bytes) in /web/servers/xxx.com/docs/admin-xxx/listcontent.php on line 1091, referer: http://xxx.com/admin-xxx/listcontent.php?_s_=2258f617
The line it is referring to is:
echo $themeObject->DisplayImage('icons/system/contractall.gif', lang('contractall'),'','','systemicon').'';
Do you think this may have hit some kind of page limit - if so, any ideas why it has only affected a couple of users and not all..
I really am quite baffled..!!

Thanks in advance!
Kendy