URGETN ! piwik 2.2 does not work

Since I automatically upgraded to piwik 2.2, piwik does not respond any more .
I get the following error joined in the capture file .

Thanks for your help …

Try to increase the maximum script time in your web configuration

http://stackoverflow.com/a/9630627

Hello,
Of course I already tested that… No way I increase max_execution time up to 600 !!

It sems the piwik script goes into aninfinite loop somewhere …

Please help…

PS I seriously think to downgrade piwik. Is it possble without any damage ?

Check in your web server error log files for a particular error message ?

The only error message I get is the one I mentioned in my first post :
[Mon Apr 28 11:31:48 2014] [error] [client 130.223.16.33] PHP Fatal error: Maximum execution time of 600 seconds exceeded in /var/www/html/piwik/libs/HTML/QuickForm2/Node.php on line 222

And I have exactly the same if I still lincrease the max_execution_time parameter in PHP… !! I tried up tpo 3600 !!!

It seems it goes in an infinite loop … The same for memmory !!
For info, in my apache web server I have Timeout = 600

I could find out the problem came from LOginLdap plugin which was activated but not compatible with 2.2.0 !!
I deactivate it in config.ini.php and reactivate the standard Login plugin . .and could finally login to piwik !! Ouf !!!

IM