Error Message after Joomla Update to 1.5.11

Hallo,

after the Joomla Update from 1.5.10 to 1.5.11 no files are uploaded anymore. I get following error message:

Warning: File upload error - unable to create a temporary file in Unknown on line 0

Warning: File upload error - unable to create a temporary file in Unknown on line 0

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent in /home/acg-gmbhde/public_html/acg/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent in /home/acg-gmbhde/public_html/acg/libraries/joomla/session/session.php on line 426

What could be the problem?

Link: http://www.acg-gmbh.de/acg/index.php/component/option,com_chronocontact/Itemid,99/chronoformname,Bewerbung/text_1,244%20Organisationsberatung%20GKV/Error

Hi karat205,

I'm not sure why this happens, try to backup your form OR another test form with the problem and attach it here!

try to create a new form and test it too to see if its a problem with existing forms only ?

Regards
Max