Wordtube Won't Play Full Video

I used to use Wordtube all the time and be able to load videos perfectly, but now everytime I load my videos, the buffering bar loads halfway and then just skips to the end. When I press play, the video plays up to that halfway point and then stops. I have JW-FLV player 5.0 and I tried using the 5.3 version but the same thing still happens. When I use youtube videos, though, it loads perfectly. Each time the video freezes at a different spot. I am currently using Wordtube version 2.3.1. Would using an older version of wordtube work?
Thanks in advance.