I have a multiple monitor setup for my 2013 macbook pro 15" (750m version). 3 Monitor Setup Configuration: MBP Display(left) - Thunderbolt Display1(middle) - Thunderbolt Display2(right) I usually use the MBP Display for skype/chat/finder/etc, and rarely ever have any full screen apps on it. The TB Display1 and 2 usually have 2-3 FULL SCREEN apps/desktops on them each, containing a combination of browsers and word/excel docs. The reason I do this is because I use the trackpad religiously, swyping between desktops/full screen apps on each monitor depending on where my cursor is and where I need to be. So I need each desktop laid out exactly how I want it. This is why I switched to a Mac from Windows, this layout makes me incredibly efficient switching between desktops/apps and monitors. It's truly awesome. The problem is, whenever I OPEN a new application, all the full screen apps/desktops get re-arranged. If they get moved around, then when I swype to a new desktop on any given monitor, it's not the program/app that I want, and then I have to open up Mission Control and re-order them all over again. It's fine when I don't need to open anything new, but whenever I do I have to go back and re-arrange everything the way I had it. It kills the efficiency I gained in the first place. Why does Mavericks do this? Am I just using Mavericks wrong? Is there a way to lock the desktop/full screen apps order? My preference would be that any new program I open will appear on the MBP Display (left) since I don't use any full screen apps on that display. If I eventually wanted to make that app full screen, I could initiate it and move it over to my main displays. I don't want Mavericks to touch my TB1 & 2 (middle & right) full screen apps or desktops at all, or re-arrange them in anyway. I would like them to be locked, and have it be so they can ONLY get re-arranged if I go in and do it manually with mission control or equivalent. It's driving me nuts. I am coming from Windows 7, so I'm a bit new to Mavericks, but I don't remember Windows 7 ever doing this. Any ideas? I can create a screencast of the issue if it's not making sense.