Something to keep in mind: I have seen the slaves on B's with the bleeder under the inlet hose(on some other makes as well) Makes it impossible to get all the air out unless you do what you can by pumping the pedal and cracking the line, then pull the bolts out of the slave and let it hang down with the bleeder open and let gravity finish the job.
Another trick to use is to make sure you have bled it as good as possible, and if it still doesn't work, get under the car with a prybay and have someone push the pedal. Wedge the bar between the fork and the engine or tranny and help pull the lever back. Have them let up on the pedal, prying on the lever to keep the clutch engaged, and push the pedal down a couple more times. This will force more fluid down to the slave, giving it a little extra gulp of fluid. When you remove the bar and they let up on the pedal it should be good to go.