Well, it has to do with the underlining on Menu Items.
To re enable this:
Right click desktop, go to Properties. Click Appearance Tab. Hit Effects.. in the lower right corner.
Uncheck "Hide underlined letters for navigation until I press the Alt key".
That will fix the problem.
The temporary fix is to just push Alt before using the radio buttons.
but yes, it's appearance only, clicking where you're supposed to will select the option properly.