Comment 5 for bug 194973

Is your "Motion Blur Mode" set to Texture Copy or Accumulation buffer?
I get absolutely no weird effects with Accumulation buffer (which is the default one), but the less resource intensive Texture Copy mode does exactly what you describe. Everything turns a shade of white, and the window borders are mainly a yellowish color, but flash bright orange (human theme orange) Sometimes the whole screen even flashes its normal colors for a fraction of a second, and then goes back to the whitish shade.