Yesterday my clutch started acting funny. While the car is running it is now frequent to depress the pedal to the floor and the clutch will not fully disengage, so I cannot put the car in gear without grinding or rev matching, if it goes in at all. This is happening 3/4 of the time, and seems to get worse as the car has warmed up and been shifted more. Occasionally the problem goes away though. So far I have checked clutch and brake fluid levels, and both are fine, and have been for the 6 months I have owned the car. I have checked for leakage around the master and slave cylinders, and both are fine. And I have also checked and adjusted the pushrod from the pedal to the master cylinder. i am thinking that the throwout bearing is dying/dead, since the clutch does not slip at all. Or could this possibly be a bad master or slave cylinder even though there is not any leak? Just trying to get some opinions before I go buy parts and pull my tranny off.

Cliff notes: is my master cylinder possibly bad, or my throwout bearing?