Hi Eric and thank you for your patience. I have 2 mac minis. One is a 2010 (not the base model, but the second) running Mavericks and my new one I bought 2 weeks ago and obviously has Yosemite. The old one's days are numbered due to an impending hard drive failure. I use a Philips 32" smart TV as my monitor. On the old mac mini, Display under system preferences would identify the monitor as Philips FTV and offered the native resolution (1366x768) as an option for the display. This gave me a picture that took up the whole screen without distortion. Yosemite identifies the monitor as a Philips FTV but offers me only two resolution options if I choose optimize for display: 1280x1024 or 800x600. If I choose optimize for Philips FTV I receive 4 different options: 1080p or 1080i or 720p or 1280x768. 1080p results in very small script, leaves a two inch black border on the desktop on the left and makes it impossible to access the dock which I have positioned on the right. The other three resolutions leave a large black border above and below the visible desktop. All four options result in a distorted desktop which makes pictures impossible to enjoy due to the distortion. The other two resolutions optimized for display are better, but not satisfactory. 1280x1024 takes up the whole screen (no black borders) but has a very elongated distortion. The least distorted is the 800x600 which Yosemite seems to prefer, but the icons are enormous and only half of Firefox or Safari screens are visible and I have to move the bars at the bottom of, and the right side of the window to view the whole page.
I can't understand why I have no problems with Mavericks and can't get a distortion free resolution with Yosemite using the same monitor.
