If it hasn't been finalized it will have limited if any compatibility with anything other than the Liteon. What mode (speed) did you record at? The liteons have known problems finalizing near full disks. So if you recorded at 2 hour speed and stored two hours of video it may be a potential problem (It should not be, but these are liteons!).
I have had the same problem from time to time with it not finalizing and have found that if I try multiple times, it eventually works.
It could also be a media problem. Have you had any issues with the particular media you used on the liteon before, or are you trying a new media?
While this sounds backwards.... If it is a critical event. You could play it on the liteon and record it on a VCR or better yet someone else's DVD recorder. I have saved some critical recordings by moving them from my 5005 to VHS, when I could not finalize. I realize this seems nuts, but it is a question of desperation.
Hope some of the above is useful.