Hello again. It has been a long time since I looked at my project.
I have never noticed what appears to be background that is not masked for calling form that have rounded corners (extended borders turned off). This only appears for skins that have rounded corners which is obvious.
Is this a normal condition now? Like I said, I have not kept up with version 15 progress since it came out of beta.
I put together a project that demonstrates what might be problem or not.
The use of setting the form disabled when calling the dialog and then setting the form enabled is part of the SkinProvider DisabledBlured routine. However, if you do not set this routine and have the form disabled, the “pink” corner edges appear.
To prevent this in my code all I have to do is not disable the form if the blured routine is false.