Hi,

Did you encouter any issue during the K2 upgrade? I would start by checking the installer trace for any errors during the upgrade (i.e "C:Program Files (x86)K2SetupLogInstallerTraceXXX_1.log")

Could you try to clear browser history, iisreset, and test it again? 

Hi arash,

I am wondering.. is your browser zoomed to above 100% when you get the issue? If you zoom out to 100% or below, do the controls look normal? 

browser is zoomed to 100% which is normal, if i zoom to 90% issue is still same, but below 90% it looks fine. I do not think I can ask each user to zoom in to 80%

Hi arash,

Please refer to the KBT article: http://help.k2.com/support-services/kbt147535.

This issue you are experiencing has been fixed in K2 5.1 Fix Pack 1.

Official KB article: http://help.k2.com/kb002399