Error. White window

Hello, please help to solve this error
After editing in back-end, assigning items to categories and etc. white window appears.

Also in error.log I found
[02-Dec-2014 21:35:43 Europe/Berlin] PHP Fatal error: Unable to read 4607 bytes in /home/xxxxx/public_html/application/views/xxxxxlt/lt/lang.php on line 0

There also was a warning. Could anyone explane how to solve this warning also.
[26-Nov-2014 11:03:00 Europe/Berlin] PHP Warning: Smarty error: unable to read resource:/home/xxxxx/public_html/application/views/xxxxxlt/tpl//email_order_paid_plain.tpl" in /home/xxxxx/public_html/core/smarty/Smarty.class.php on line 1093

thanks for the help

Hi,

I reckon your blank page and the error message in the error log are two different things. First of all I’d check the installation with the oxchkversion tool (can be found in admin -> tools).

Good luck