In reply to ricmu:
Trying to decipher your text.
The engine was running and you tried to put the vehicle in gear without using the clutch?
or,
You put the vehicle in gear and then when you lifted the clutch the vehicle didn't move?
If it's the latter and the clutch is now working as normal I'd guess you have something going on with the clutch release hydraulics.
This could be an easy job or could be a very expensive job depending on if the engine has a concentric slave cylinder or a easily accessible slave cylinder bolted on the bell housing.
Have you checked daft things like the carpets or mats getting bunched up and interfering with the master cylinder around the pedal?