Hello,

I tried an extensive search for this problem without any luck. My workspace works great with one exception. With windows open, if I left mouse click "ON" the desktop, sometimes all the open windows on the desktop just vanish. I get them back by hitting a key that drops down the command entry. A little digging in the log files and below are the events.
Any help on this would be much appreciated. If you require additional info, please let me know what you need. Many Thanks!
David

╭─david@lulu ~
╰─➤ journalctl --since "1 min ago"
-- Logs begin at Sun 2016-02-14 09:03:14 MST, end at Sun 2016-07-10 15:49:51 MST. --
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24196, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24606, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24607, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24608, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24609, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24610, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24611, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24612, resource id: 0, majo
Jul 10 15:49:51 lulu kwin_x11[701]: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 24613, resource id: 0, majo
╭─david@lulu ~
╰─➤

My current spec's:
---
KDE Plasma Version: 5.7.0
KDE Frameworks Version : 5.23.0
QT Version: 5.7.0
Kernel: 4.6.3-1-ARCH
Proc: i7-6700K
Mem: 31.1 GiB

Maybe ? - Bug 365014 - All windows hide on repeating desktop click : https://bugs.kde.org/show_bug.cgi?id=365014

That's it!! I could have found this if I used the term "hide". Many thanks Rog.
David