Hi,
I downloaded 2012.2 607 and Hotfix 2012.2 626 and it seems to have a problem when you use RadNumericTextbox with SpinButtons. For some reason with these builds after clicking up on the SpinButton the value gets appended instead of being added. When you try to press the down SpinButton, it doesn't work. My Code snippet is below as well as an image of the problem.