FluffyDisplay no longer works under macOS Sonoma

[F1248]

Thank you for this very handy tool! It is exactly what I need.

Unfortunately, exactly since I upgraded my MacBook Air M1 (MacBookAir10,1) from macOS Ventura to macOS Sonoma 14.0 (23A344), I am no longer able to add a virtual display. The app launches normally and appears in the menu bar, but when I click on "New" and then select any virtual display, nothing happens. Neither in the app itself nor in the System Settings / Information does the virtual display appear.

When I download the source code and start the app from Xcode, the app behaves exactly the same, every time I try to add a virtual display without success, Xcode gives me the following error message:
-[VirtualDisplayClient pluginWithOptions:]: spawnProxy message error kr=0x5((os/kern) failure)

Unfortunately, my knowledge is not sufficient to solve the problem myself, so I would be incredibly grateful if you could solve it!

Thank you, F1248

[cui3301]

same issue here, please help

[topcheer]

In VirtualDisplay.m changing following descriptor properties to non-zero works for me

descriptor.serialNum = 1;
descriptor.productID = 1;
descriptor.vendorID = 1;

[F1248]

In VirtualDisplay.m changing following descriptor properties to non-zero works for me

descriptor.serialNum = 1;
descriptor.productID = 1;
descriptor.vendorID = 1;

Thank you so much! I don't understand it, but now it works again!

By the way, I have found out that it is sufficient to change only descriptor.vendorID to 1, the other two values can remain unchanged at 0.

[topcheer]

In VirtualDisplay.m changing following descriptor properties to non-zero works for me

descriptor.serialNum = 1;
descriptor.productID = 1;
descriptor.vendorID = 1;

Thank you so much! I don't understand it, but now it works again!

By the way, I have found out that it is sufficient to change only descriptor.vendorID to 1, the other two values can remain unchanged at 0.

I don't understand either since it's an undocumented API but my experience tell me that somewhere above the error thrown point has the fix 💯

[alibekch]

In VirtualDisplay.m changing following descriptor properties to non-zero works for me

descriptor.serialNum = 1;
descriptor.productID = 1;
descriptor.vendorID = 1;

hey there, how do you compile the code and run the compilation?
(i can run the standalone app, though have no idea how to do it after downloading source files)