Comment 29 for bug 520941

You should be able to use the old project file with this patch. Note that the bug was that gaps between clips of 1 frame were never shown in the preview/final render, but were taken into account when calculating the timings of transitions, thus leading to the glitches. So you may notice single frame gaps in your old project which you wouldn't have seen before (but were technically there all along).

So although you can use old projects, you may need to adjust them to remove the gaps which were causing the problems in the first place.