Windows 10 x64
Broken: 2.78 BuildBot(3ceb68c) 2017-03-18
Worked: 2.78c Official (e92f235283)
Short description of error
Blending scene strip with alpha over blend type, works ok in opengl preview but the blending in not applied when the image is rendered.
Alpha is set to transparent in render properties
Left Buildbot----------Right Official 2.78c
Exact steps for others to reproduce the error
Just open the blend file and render image or tick/untick "Opengl preview" in the VSE "Scene Preview/Render/OpenGL Preview" and "Refresh Sequencer"
1 Blend file
1 Png image