Has/Had the trans been leaking fluid? or has it been scrubing syncro's prior?
How long has it been since a clutch change? (just hoping the P.P. bolts havent worked loose"fingers crossed")
Just tring to rule some things out... but it deff. sounds like a clutch issue... Might want to pull the fork boot out while your at it, for a better look around...
Go ahead and check the fluid level and rule that out...
*Have a friend spin the engine over w/breaker bar and check the leaves/springs on the P.P.(look for either defourmed or broken leaves)
*Check the pivot in the channel of the fork and the "ears" on the through out/release bearing for defourmation and broken areas...
*Make sure there isn't a gap around the trans to engine mounting area(i.e. if it's pulled apart, it isn't going to disengage the clutch fully)