System Information
64bit Manjaro Linux, kernel 3.19
GeForce GTX 650 Ti Boost, driver 346.59

Blender Version
Broken: 2.75-dev, hash bdf6393
Worked

Short description of error
When rendering while the Save Buffers option is enabled, the image being rendered is not displayed and is instead left blank until the render finishes, at which point it will finally display. This happens with both Blender Internal and Cycles. Does not occur in 2.74

Exact steps for others to reproduce the error

1. Open any scene.
2. Go to the Performance tab under Render settings and enable Save Buffers
3. Render.