Exactly the same here for
WP v3.5.1
polylang v1.0.2
Theme: Twentyeleven (tested with theme version 1.3 and after upgrade to current v1.5).
Only affects randomly rotated uploaded header image, not one fixed uploaded header image.
For now I use just one header image, site: http://www.leidsamateurkunstfestival.nl/en/