I have one video that I've split into three segments, and I've overlapped the three and added transitions at the two junctions. I added the same transition with the same settings to both overlaps. The first transition works fine, the second doesn't: it doesn't show in the preview OR in the render.

I've made quite a few videos this way with Vegas and have not encountered this problem before. I'm at my wit's end. Does anyone have ANY idea what I can try for this? I've tried saving and reopening the project, removing and re-adding the transition, trying different transition effects, and nothing has helped. The video plays the same with (or without) any transition. But again, the first transition behaves correctly; only the second (theoretically identical) has any issue.

Thanks in advance!