Clutch trouble

[Kevin Andrews <kevina@wolverine.emji.net>]

I have put a new clutch master and new slave in on my 250. The problem
I have got is that it will not disengage. With the car running, I put it in gear
and let the clutch out. Nothing. The car just sits there in gear with the 
clutch out.
I can turn the car off and it will then work.I have put a new clutch  and 
bearing
in when I got my motor rebuilt. The clutch plate was in another 250 that was 
wrecked. No grooves in it. So why am I having this problem after a month when 
it worked fine?
        Need help before VTR Regional! Kevin Andrews
                                        Siler City,NC
                                        TR-250(CD7766L)