Issues with Inserted Back and Fore Colors

[broderickt2]

When using the UI properties editor, when I try to set one of the inserted colors back or fore, the other one changes to it as well. I cannot alter these colors to be different in UI editor:

Since the UI color picking is not working, I decided to set the colors programmatically as shown below:

diffViewer.InsertedBackColor = Color.Orange;
diffViewer.InsertedForeColor = Color.Gray;

However, setting InsertedBackColor to orange is not working. It just stays stuck as green. Only the fore color setting is working. I tried all sorts of colors and nothing is working.

Looking into the code. I found an issue with the core references: