Debugging GDI Handle Leaks
Many years ago, I was working on a dotnet Windows Forms application. The application had many issues overall: memory leaks, random crashes, data loss, and in this case, the “red x” problem. The problem showed up at random, and instead of a window, dialogue, or control being rendered, it would be replaced with a white box with a red outline and red diagonal cross, and I think some error text in one corner, saying something about GDI handles....