my Final Cut Pro 4.5 HD keeps coming up with really annoying problems.

usually after I've captured from DV-PAL firewire it just disappears into thin air without saving. with isn't MUCH of a problem because they go straight to the capture scratch, all i have to do is drag um back. but id rather not have to. anyone know why this is and how i can prevent it?

and another thing, witch is REEEALLY annoying me is that my canvas window is terrible quality!!! everything is fine when paused or when shown in the viewer, but looks terrible when its on the canvas!! its all pixilated and grainy!!

can anyone tell me how to make it good quality!?

any help would be much appreciated!