I have had this a couple of times now.
When changing gear high up in the rev range sometimes it seams like the clutch is not releasing. When you let off the gas and put your foot on the clutch the car just slows down like you have let off the gas. You can get it out of gear but it goes with a bit of resistance then its ok.
Happens mainly in first but sometimes in second.
Anybody else had the same prob.