After beating all of the first 7 Worms 3D campaign missions on worms ultimate mayhem i cannot progress any further than that. Also playing on XBLA. Just thought i would report the problem and see if there are any solutions.

It's not a bug. To unlock more W3D missions, you have to beat the first set of W4 missions (and so on).

Due to the amount of confusion though, they probably should have made this clearer (or just had the W3D missions unlock as you beat them)

Thanks, much appreciated.