First I saw an issue when using an overlap or cross transition between two clips. It would result in the second clip being completely blacked out for its entire duration, the transition would otherwise work correctly, except for the fact that it was transitioning to black instead ofthe other clip.
Before adding the transition I checked that both clips were playing correctly.
The next issue I saw was fade in and out transitions on text titles were reversed. So that the title would pop into view, fade out, pop in, pop out, fade in, pop out. Rather than just fade in, fade out as I had specified. This would sometimes correct itself when I closed and reopend the project, but it would quickly return to failing in the manner described above.
This sounds very much like an issue described a while ago in a previous version of PowerDirector. Link to the issue here http://forum.cyberlink.com/forum/posts/list/19000.page;jsessionid=50B41700C89000484701FE227A003966