Currently Being ModeratedAug 12, 2012 6:10 AM (in response to zverko)
Have you tried resetting the printing system?
System Preferences>Print & Scan, Control+Click or right click on a printer on the left and select 'reset printing system...'. All your printers will be deleted and need to be added again.
If you still have scanning problems after that, you could try using Image Capture in the Applications folder for scanning.
Currently Being ModeratedAug 12, 2012 6:22 AM (in response to zverko)
Mmm. Have you tried re-installing the software? http://support.apple.com/kb/DL907
Maybe re-applying it will help.
If that doesn't work, not a solution but a work around, you could try VueScan (a paid for app) that you can run in demo mode to see if it works before paying for it: www.hamrick.com
Currently Being ModeratedAug 12, 2012 6:47 AM (in response to zverko)
Double posting won't improve the answer.