Im having exactly the same problem as you!! could you post when youve fixed it and tell us what the problem is? I would really appreciate that because i really dont know whats going on. Ive replaced the thrust release bearing and plunger and going to test it today see if it has made any difference. Could it be a worn clutch plate?
I'll make sure I post up when I get the issue solved so anyone with a similar issue at least can have an idea of what it is
Finally got round to removing the clutch today and found out the clutch was actually stuck to the flywheel!! Also the clutch plate itsself is very worn.