Have you tried a system restart? Sometimes the keyboard driver can get clogged up and not register.
Also note that for programs to interact with each other, they must both operate at the same privilege level (If one is running as admin, so must the other.)
I am not sure if you are on Windows Vi$ta, but if you are on Windows Vi$ta, then that's the reason why you are having problems. Windows Vi$ta is $HIT! (My opinion!!!)
If you are not on Windows Vi$ta, then disregard this please.
Not sure if I'm swearing with the "$" instead of the "S", but if I still am, then I apologise.
If not already, upgrade to Windows 7...
[Edited by KaozVirtuz, 11/19/2014 12:31:21 AM]
You can't buy those crafting items you just sold from "crafting items" column. You have to buy them back in "Buy Back" column, the rightmost one.