I've got the same thing

Fatal error: Call to undefined method ModQuickIconHelper::groupButtons() in/homepages/14/d238656661/htdocs/dev/administrator/modules/mod_cck_quickicon/tmpl/default.php on line 14

I made some changes in the configuration of seblod - I think turned on sef.

System Information

Setting	Value
PHP Built On	Linux info 3.0 #1337 SMP Tue Jan 01 00:00:00 CEST 2000 all GNU/Linux
Database Version	5.1.72-log
Database Collation	utf8_general_ci
PHP Version
Web Server	Apache
WebServer to PHP Interface	cgi-fcgi
Joomla! Version	Joomla! 3.1.1 Stable [ Ember ] 26-April-2013 14:00 GMT
Joomla! Platform Version	Joomla Platform 12.2.0 Stable [ Neil Armstrong ] 21-September-2012 00:00 GMT
User Agent	Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19

Joomla running not in root folder. tried setting live site value in configuration.php but no joy.

Joomla control panel dashboard seems to be what is affected.

I have sh404sef installed, and that is upgraded to the newest version for compatibility.

Did not make a backup before this upgrade :-(

Clicked on system information
extension manager
module manager
administrator modules
disabled the Quick Icons - SEBLOD module

Now the dashboard works again

Seems to be a problem with the quickicons administrator module.

Please let me know when this is fixed.
Thanks.

Even after updating to the latest Seblod 3.2.2, the problems still exist. Going to /administrator still shows a blank white page.

Same problem for me.

I did the following action as msimko explained:

Clicked on system information
extension manager
module manager
administrator modules
disabled the Quick Icons - SEBLOD moduleext


Worked! :)