Comment 12 for bug 577012

When testing older revisions I still have archived to narrow down when this started, I compared these revisions:

9420
9410
9395
9364
9366
9384
9388
9366
9359
9349 -> this doesn't show this bug
9350 -> has this bug

and I still see the posterized rendering with a completely new build of 9424 (after upgrading to GTK+ 2.20.1)

and I tested again today:
9424, 9358, 9350 show the bug
9358 is ok