Hi, AnonymousZao!
I just tried posting a reply to your question and, when I clicked to post it, the post went
"ker-blooey". This happens sometimes! Best I can suggest here is to create the sequence you want as a separate item and render(produce) it. Then drop that rendered clip into your complete video. When rendered the first time, you've gotten past any glitch(the problem might be trying to render the reversed sequences as part of a longer overall video item), but if you create the short sequence on its own first, you can add it to the rest of your video as if it were just another clip you insert as you assemble your overall movie. I use video-in-reverse for comic effect, kid dives into pool, split at point before dive, count off one second(25 frames, in my case), split again. Copy and paste the 1-second portion 6 more times for a total of 7 portions, then reverse the 2nd, 4th and 6th portions, you can see the effect in your mind's eye. Thing is, if I try to do this as part of a complete movie, I run up against the same problem as you, PD14 "hangs" when rendering the second "reverse" portion., So I figure, one way around this might be to create the comic sequence first, render it, then drop the render into the movie at the appropriate spot in the video, having already been rendered once, it should not give trouple when rendered again as part of the whole movie.
Cheers!
Neil.