System Information
Windows 7 and Intel HD Graphics 4600
Blender Version
Broken: 2.75a c27589e
Worked:
Short description of error
Video clips become misaligned when rendering video sequence and Render Display is set to "Keep UI". Overall, using soft cuts on clips causes occasional misalignments, as if Blender "forgets" where the cut was. But it is especially apparent with the "Keep UI" option.
Exact steps for others to reproduce the error
Put together a bunch of uncompressed video clips, with lots of soft cuts.