stubborn gearbox

While the car is stationery the it goes into gear spot on, but on the move it's reluctant to come out or go into gear. It was ok this morning, but today I've been doing a track day. But the clutch and slave cylinder were only replaced in march after that gave up in Yorkshire.
 
On and off, yes. I would suspect the clutch if it hadn't just been done 6 months ago. It as if the clutch pedal doesn't push the clutch far enough, but it feels fine when setting off, the problems start when you change gear.
 
Any fluid leaking around the bottom of the bellhousing ?

Chris had a brand new slave fail after 800 miles
 
its one of those pull apart type fittings on the top side of the box - its got a bleed fitting on the top of it