Hi, Thanks for the move...I realized my error and wondered if I should let you move it or repost. And thanks for the reply Master Tao, I'll further display my ignorance on forums and with some aspects of Macs. And yes, I have an old system, time to upgrade as soon as I'm able, but I was happily able to run Kerbal good enough for now. Should I include a .log file, which one and how? Otherwise, I hope this helps as well: KSP version: 0.25.0.642 KSP Store, not Steam Add-ons/Mods: None System: OSX 10.6.8 MacBookPro 2.16GHz Intel Core Duo 2GB 667 MHz DDR2 SDRAM (If I remember correctly, I read that I could install 4GB but it would still only show 2, I believe I took out a single 1GB chip and installed 2 2GB chips several years ago for what it was worth) What happens: I connect the laptop to my HDTV with a DVI-HDMI cable, I set the second monitor for 720p and Kerbal to 1280x720. With screen arrangement set to second monitor (TV) the screen goes black and won't switch back to windowed. This is while using "Apple-F". This also happens if I select Fullscreen on the settings menu and accept or apply, and likewise with the top menu option from windowed. With screen arrangement set to laptop, Kerbal will switch between fullscreen and windowed without delay or problem. Changing resolutions or other graphical settings has not had an effect as yet, works fine on laptop, not on second monitor, I will try some more as well soon. I resorted to playing some on the laptop screen for now. Anyway, This has worked fine for me since version 0.19 and was used up to 23.5 without trouble. I have not tried ver 0.24. Not sure what else I could include other than some system log or Kerbal log that is mostly a foreign language to me these days. I understand some of it. Thanks again. Here's some lines from the player.log after switching to the second monitor arrangement and changing to 1280x720, then pressing Apple-F: Switching to 1280x720 fullscreen Could not find requested mode. (Filename: Line: 104) Switching to 1280 x720 failed! Trying second best guess. Switching to 1344x756 fullscreen Could not find requested mode. (Filename: Line: 104) Switching to 1280 x720 failed! Trying second best guess. Switching to 1280x960 fullscreen Could not find requested mode. (Filename: Line: 104) Switching to 1280 x720 failed! Trying second best guess. Switching to 1024x768 fullscreen Could not find requested mode. (Filename: Line: 104) Switching to 1280 x720 failed! Trying second best guess. Switching to 1344x1008 fullscreen Could not find requested mode. It goes on and on until I force quit. I can include that but it seems redundant. I haven't found the output_log.txt yet, will update and check back tomorrow. (Filename: Line: 104) Switching to 1280 x720 failed! Trying second best guess. KSP.log: [WRN 01:27:27.770] [HighLogic]: =========================== Scene Change : From MAINMENU to SETTINGS ===================== [LOG 01:27:29.061] Launcher start settings screen: True [LOG 01:27:29.074] Joystick Names: [LOG 01:27:43.735] Launcher here (in apply): True [ERR 01:28:09.840] Could not find requested mode. [ERR 01:28:09.841] Could not find requested mode. [ERR 01:28:09.841] Could not find requested mode. [ERR 01:28:09.841] Could not find requested mode. [ERR 01:28:09.841] Could not find requested mode. [ERR 01:28:09.841] Could not find requested mode. [ERR 01:28:09.841] Could not find requested mode. [ERR 01:28:09.842] Could not find requested mode. [ERR 01:28:09.842] Could not find requested mode. [ERR 01:28:09.842] Could not find requested mode. [ERR 01:28:09.843] Could not find requested mode. [ERR 01:28:26.109] Could not find requested mode. Sorry if this is pointless and not helpful...Thanks!