After updating to DisplayFusion 9 (and the same with 9.1), the extended taskbar has some issues.

What causes it, I have yet to figure out but the symptoms are that the taskbar starts to flash once per second. When that happens, no new icons appear in the taskbar if I move a window to it. Both windows opened on the second screen, and windows moved to it.

Additionally, windows that were up on the second screen before the freeze which are closed afterwards, appear to stay in the taskbar. I can click the icon, but nothing more happens.

If I try to open settings and disable/enable the taskbars, it dissapeares from the second monitor but will not re-initialize.

I've tried shutting down DisplayFusion and opening it again (Windows Task/Processes) without any fix. The only thing that has solved it is a reboot.

Windows/Video-drivers and such are updated.

I also wanted to point out that I am having taskbar issues with the new Beta 9.1. The taskbar does not behave correctly when it comes to always on top. In fact, it behaves more like a window than anything.

The taskbar(s) should ALWAYS be on top unless there is a specific setting to override it (which I have not found).

One of the anomalies that I have seen is with hidden DF taskbar. If the start button is enabled, it is always on top but if the start menu is disabled the taskbar is allowed to be covered. This behavior is slightly different when the DF taskbar is not allowed to auto-hide.

EDIT: I attached a screenshot showing all 3 monitors. Left=Native taskbar, middle=DF Taskbar with Start Menu, right=DF Taskbar without Start menu.

Noticed something new. When the freeze happens, the Ctrl+Shift+ESC hotkey to bring up Windows Task Manager doesn't work.

I can still access it both via the Right-click shortcut on the DisplayFusion taskbar, or via Windows Settings, but not with the key-combination.

And now, I found a weird workaround; When leaving my desk I tried to use the hotkey WIN+L to lock the computer. But that didn't work, same as with Ctrl+Shift+ESC. So I did a Ctrl+Alt+Del to access the fullscreen menu in Windows7 where you can Lock, Change users, Logout and such.

When I did that, everything blinked a couple of times, and suddenly everything worked as it should.

Here's the debug info.
You can start at 2017/11/22 11:30:00 and look backwards. I came back to my desk after about 20 minutes away, and noticed the taskbar had frozen again.
At about 11:31 I attempted again the Ctrl+Shift+ESC and WIN+L hotkeys incase the log registered them. They did not work. Same as before.

I then did the Ctrl+Alt+Del, and like before it fixed the problem.

You were correct. It was running DFSSaver.scr *32.
Killing it via Task Manager fixed the issue.

The error does not trigger with Preview Screensaver, both in DisplayFusion and the Windows screensaver settings, but will trigger with normal screensaver activation. Testet with a couple of different Timeout settings.

Actually, that's not correct.
If it matters for future bugfixing, I was using the Windows Ribbons screensaver.
I was thinking I could try one of the DisplayFusion screensavers to see if the same error occured, but while running through preview on those the error triggered again.

Killing the process still works fine to fix it.