When gnome-icon-theme is not installed some icons are not displayed correctly. Reproducible: Always
Confirmed here as well
+ 27 Aug 2014; Sergey Popov <pinkbyte@gentoo.org> + remmina-1.0.0_p20130723.ebuild, remmina-9999.ebuild: + Add x11-themes/gnome-icon-theme to dependencies, prevent missing icons, wrt + bug #516412. Thanks to Francisco Javier <ffelix AT inode64.com> for + discovering this issue