shotgun desktop under linux does not show project thumbnails

Hello

When I start shotgun desktop under linux, everything works fine, but it does not show thumbnails of project. In the console it says

QPixmap::scaleHeight: Pixmap is a null pixmap

In windows icons are shown right.
I believe I'm not the first who faced the problem, please help me with the issue.

That's the basic information about my distro:

env | grep DESK
DESKTOP_SESSION=1-kde-plasma-standard
XDG_SESSION_DESKTOP=1-kde-plasma-standard
XDG_CURRENT_DESKTOP=KDE

cat /proc/version
Linux version 3.10.0-327.18.2.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu May 12 11:03:55 UTC 2016