This is a different issue, it has been reported elsewhere and is fixed already. Thanks for the note anyway.
https://launchpad.net/ubuntu/+source/kde-guidance/+bug/78891 -- Icon sometimes turns into generic "blank paper" icon https://launchpad.net/bugs/75531 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
