Monitor names can now be viewed/edited in the monitors grid panel
Tidying up of monitor name ordering
This appears to be a file permission issue. I take it that you have manually edited the image to remove your user name? Please can you use Windows File Explorer to have a look at the folder specified in the error window. You have not mentioned any problems in configuring the Wallpaper Changer, so this folder should have files like DmtSettings.xml and DmtWallpaperProviders.xml amongst others. Does this folder have a DmtWallpaper.jpg file? If it does, then if it has the "Read-only" attribute, then...
Can order monitors by name (needs further optimisation/clean up)
Users can now give their own name to each physical monitor
Sorry, I don't quite follow what the problem is. One thing to be aware of is that user-defined areas include the border around the window, but this would make the window appear smaller, so I guess it is not the problem you are having. Note: You can also use "System Defined Areas" to split your screen into a left and right half using the numeric pad 4 and 6 keys together with a selected modifer key. In this case you can select whether or not to put the border on the inside or outside of the half ...
Monitors table now shows the GPU that the monitor is attached to
DisplayDevice now has the unique device path for the monitor (work in progress)