Strange resolution issue

[Hawks64]

I am having an issue with Teamviewer 9 that started when I put in a new ATI Graphics card. When I connect to my HTPC to do remote work on it the screen resolution constantly changes and I can't figure out how to get it to stay on one resolution, it's pretty much useless as it will change in the middle of me doing something and often results in the wrong thing being clicked on. I have changed in teamviewer under view changed the scaling and resolution to no avail. I have set the resolution on the desktop and it just keeps doing it. Do you have any suggestions?