Right after plasmashell started all the windows appear in the task panel and icons appear in the system tray but they won't redraw any longer. i.e. they are still can be clicked and do show popups when hovered, but when windows close or open, or change the position the utilization of the panel becomes unusable. The only thing that helps for a certain moment is to kill plasmashell and run it once again. The problem first appeared yesterday, Sep 4, after semi-automatic update launched from "System Update" widget. I can provide more information if you guide me with a short "howto"
Likely the problem lays in the package "xorg-x11-drv-intel.x86_64-2.99.917-15.20150729.fc22" Meanwhile I've downgraded it down to v.2.99.917-6.20150211.fc22
fc23 with xorg-x11-drv-intel-2.99.917-16.20150729.fc23.x86_64 is also suffering from this disease
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Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.