clutch/tranny problem

[1slowdsm]

Ok. hopefully this will be the last time I'll have to post about some transmission issue.

Well last week I got a working tranny in my car and all gears worked fine, just a bit rough and downshifting to 2nd and 1st at a stop is a bit tricky and rough at times. Reverse worked fine, but this morning when I was heading to school I couldnt reverse, so I was hoping maybe it was too cold so I drive to school anyway and at every stoplight I try going into reverse and it wont go in now. Reverse has been good all week, but now it just wont go in.
I've searched on here and came up with only adjusting the cables and clutch pedal, but still dont know why it would suddenly not work. All gears work and clutch engagement on the pedal isnt near the floor at all, so adjusting it doesnt seem like it would help.
Any ideas I can try once I get out of school?