Two sided face issue.

I’m sure this is a well discussed topic, though my problem is unusual. I add an object(not a plane, half a cylinder), and UV texture it, click two sided, and it only 'two sided’s the last clicked face. Forcing me to ‘two sided’ all of the faces individually. Any thoughts? Tried a restart and a reinstall. And a couple of different .blend files. No success.

There should be a copy button to copy the setting to all selected faces, but I’m not sure if its there in 2.5 yet.

Cheers dude. Never had to use this button before so didn’t know.