Window Title Bars Hidden after Resuming from Locked Screen

The title bar at the top of windows sometimes disappears after applications have been left open and the computer has locked the screen. When I resume, the windows are missing their title bars and the resizing and closing buttons. It prevents the background windows that are open from being closeable. Right clicking on the application menu at the bottom taskbar panel opens the menu but none of the resizing or close options work. Applications that are opened after the screen resumes don't even show up at all on the taskbar panel.

If I logout from the Application Launcher "Leave" menu and log back in, the existing windows will be open with the proper title bars and menu options restored.

See attached screenshot for an example of what it looks like. Firefox was opened after the resume and is not even listed on the taskbar panel.

Sounds similar to https://bugzilla.redhat.com/show_bug.cgi?id=1247618

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: plasma-desktop 4:5.5.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
CurrentDesktop: KDE
Date: Wed May 11 18:05:10 2016
LiveMediaBuild: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: plasma-desktop
UpgradeStatus: No upgrade log present (probably fresh install)