Operating system: Windows 8.1
Graphics card: Toshiba notebook, Intel core i7, AMD Radeon graphics chip
Broken: 2.79b release
Short description of error:
Final Rendering a 90-frame animation with a static hair particle system (sprinkles on a donut), from the Blender Guru Introduction Tutorial. Only the camera is moving, 2 keyframes on camera, no other keyframes on anything else. Blender correctly renders frames 0-21. Here is frame 21:
Frame 22 is rendered as though the donut with the pink icing has a different Seed for the particle generator.
Then frames 23-78 are rendered correctly. A similar problem occurs in frame 79, affecting the sprinkles on the other donut (chocolate icing). Then frames 80-90 are rendered correctly.
Here's a 3-second video, you can clearly see the two glitch frames 22 and 79.
Here are the files to reproduce the problem:
Just render frames 21 and 22, and if the sprinkles on the pink donut don't match (as shown above), you've reproduced the bug. You could do the same thing with frames 78 and 79.
I note that the problem only seems to be in the Final Render. In the 3d Viewport Solid View, and the Rendered View, the static particle system seems to be correctly static across all frames.