Live Type running very slow, rendering takes hours in FCP

Hi, I am suddently having trouble with LiveType with a project I created. It's a 1080i project, 2 tracks of text, one effect on the second track, both tracks matted to a jpeg image (so the image shows through the text). To play it in LT takes about 45 seconds to render per frame (unusual) and once done, and I import it to FCP (V 7.0.3), it takes an hour to render the 4 second-long project. The length of time is very unusual, I have been creating lots of other small projects and everything else is very fast. I think perhaps it's something to to do with the matte? The speed seemsed to drop when I applied that. Any help would be appreciated, I hope I've provided enough information. Thank you.