broken JPEG thumbnailing in nautilus 2.20

[Vitezslav Kotrla <vitko@post.cz>]

I'm having some strange thumbnailing issues with new nautilus 2.20:

1) thumbnails used to have fancy border and dropshadow, now in 2.20 they
are gone and I'm getting simple plain thumbnail without any "effects"

2) I've been using JPEG thumbnails as custom icon for some directories,
now after upgrade I'm getting default "empty gray piece of paper" icon
on some of those directories. When I try to reassign custom icon, I'm
getting

...
** Message: Failed to close thumbnail pixbuf loader
for /home/user/tmp/sample.jpg: Error interpreting JPEG image file
(Application transferred too few scanlines)
...

Image used as a source for custom icon itself is thumbnailed ok, problem
comes only when I try to use it as a custom icon for directory.

Thanks for any hint.

Vit