I have been unable to change monitor configurations since at least 9.6. It does not work with hotkeys or with manually selecting the setting in Monitor Configuration. I get the following error:

"An error has occurred while applying your new Monitor configuration.
Please check your settings and try again.
Error: Failed to call SetDisplayConfig. [HR: 31]
[System.Exception]"

The only way I can change the configuration is by manually deleting/editing the current monitor configuration.

I have updated the program multiple times to versions (both release and beta) that seemed to fix the issue for others. I also tried changing the Disable Application Hooks setting in Advanced Settings as was suggested. That didn't work either.

Any help would be appreciated.

Same issue here, I get the same error code and everything. Used to work, but no go now.

I downloaded and installed beta 4. After restarting the machine (and before as well), I got the following error:

An error has occurred while applying your new Monitor configuration.
Please check your settings and try again.
Error: Failed to call SetDisplayConfig. [HR: 31]
[System.Exception]

Unfortunately, that is the same error. Any ideas?

Here you go. Thank you so much!

What I am able to do is use the shortcut key for Nvidia surround, once it's on, then I use the shortcut key for DF to switch to setup. Once I am done, I use the nvidia shortcut again to turn it off, then use the shortcut for DF to put my screens back the way I had them and I don't get the error. Seems like I only get the error when I try to use DF shortcut to go to Nvidia surround before it is active.

deleting and resetting the profiles worked! Thank you again.