yes, i also solved it by playing with the screen parameters.

For my problem, it's like there was a 3rd screen between my PC screen and the projected screen. I could see this by moving my mouse from my PC screen slowly to the right side, and exiting the screen, normally the mouse should appear on the projected screen, but it did not right away. I had to continue to scroll the mouse to the right and suddenly it appeared.

I also fixed the problem by changing the resolution of my PC screen to 800x600 .

We're going to solve these problems.

And you're english is not poor at all.