I have DisplayFusion Pro on Steam 7.3.4. The basic functionality such as hotkeys and the multi-monitor taskbar works, but i can not open any settings windows unless using an administrator account. If i try to open a settings windows i get the error: "DisplayFusionSettings.exe - Application Error -- The application was unable to start correctly (0xc0000022).". I tried reinstalling it with Steam started as administrator, didn't work either.

It also does not try to elevate when updating the software. The updater just fails and closes. I have to run DispalyFusion as administrator in the first place to update.

It works correctly if i download the zipped version.

Using the Steam installation there is no option to change the installation folder.
I also checked the permissions of the installation folder and it has Read&Execute enabled.

Yes they do.

No, renaming it does not change anything.

I tried running it in Sanboxie. In there it works flawlessly.

Yes, that works. Somehow it also fixed the existing installation.

Today, it doesn't work again. Neither the existing version, nor the zip-folder version. And i have no clue what has changed.

Yes, i'm using Windows Defender. Also, the Windows 10 installation is just a week old.

I replaced my graphics card due to some glitches with it today, and displayfusion is working again. Could it be that the card was the culprit?

Nope, wasn't the card. It's not working again today.

I believe it to be some kind of licensing issue.
I looks like there is a 1 day licensing period before it has to be reactivated through steam.
If steam is not active, it will work until the current period runs out. If steam is active it will just continue working. But if steam is not active it doesn't suffice to start steam and try again, but I have to restart the computer (making sure that displayfusion is not in autostart), start steam, and then start displayfusion. Not quite so easy to track this down

I am using Windows 10.
I recently upgraded from Windows 8.1 (clean install), and that was when this started.

So, I took the liberty of enabling logging and trying to make some sense of this error.
1.: I should have been more specific in describing the problem. What happens is that if i open a displayfusion window, it shows me the splash screen and then the error message. The splash screen timeouts and disappears.
2.: The "DisplayFusionSettings.exe" does not have any problems itself. If i copy the arguments from the log file, it opens correctly.
3.: I'll just attach the log file for your own perusal.

I don't know where in Steam I could get the key. There is a Licence Key value in the log file though. If that is not what you need, you'll have to explain how to find the key.

From the tray icon. That's where I get the error i originally described.
When I try to open it from the context menu it just doesn't do anything. Also the context menu is missing the displayfusion icon and just displays the default application icon.

The "not working" of the context menu settings was due to having renamed the displayfusion folder. It currently works from both tray and context menu to open the settings, so I don't know if it is a tray only problem. The icon is still missing though.

The Icons are back now, after restarting with the folder renamed to the original name. Both are working right now, so I still can't tell if there is a difference.

It's been not working for 4 days now. No idea what makes it work or not work.

Here you go.
Hasn't been working once to open it from tray or contextmenu since I replied last.

It starts with windows.

Regular user.

Tried it, doesn't change anything.

I have to expand the problem description a little.
Additional to the previous problems, I have discovered that the invocation of any commands, such as opening taskmgr or using right click commands on running applications (except close), through the displayfusion taskbar produces the same error.