I'm working in the Video Sequence Editor on an hour-long project incorporating hundreds of strips. I recently added a speed control strip and, after doing so, found that PgDn no longer jumps to the previous strip. It now jumps to frame -2147387044, which does not exist in my project! More specifically, Blender only jumps to that frame when using "Jump to Previous Strip" at points on the timeline after where I added the speed control strip.
I tried removing the speed control strip from the project, but the problem continues.
This problem only happens in the specific project file, and not in other projects!
"Jump to Previous Strip (Center)" continues to work correctly.
I'm using Blender 2.78a, but the problem remains if I try version 2.79.
Any help correcting this would be greatly appreciated!