The time i posted my last post, i actually had CTD bug on my own map hehe, fixed it and reason was that i had some object in my map which was buggy, it didnt give me error message when it crashed on 100%.
I dont know which object it was because there was so many what i deleted (i usually put loads of objects to empty area of map, then when im thinking "what objects i could put to this location" i just go to my object storage and pretty often i find some object fitting there from the "storage" ^^
All objects i know that causes crash on desktop are some of the 5 or 6 padogas, the middle east gate thing (wooden piece of fence with half opened door)
+ all objects which dont have textures
So try removing all padogas and all objects which has the default white/blue/red texture on them. If that does not help, try removing all objects which you havent seen in any other map yet. But one thing is sure, having buggy objects makes your map crash after it has been loaded and "join game" button is about to appear, and this doesnt give you error message.
2x2km map ? dunno if that needs some special stuff to be done before it works ?
Anyone know?
Also one thing what im not very sure about, but if you placed animation object (what ever those are called) like smoke, fire, waterfall, and your starting camera is just next to it, and you have tilted those animate objects, it should crash when you press "join game" button.
I have only read sometime ago that you can twist those animations but not tilt, if you tilt, u crash to desktop when you go close to them.
About saving your map so often, i dont remember did it make map crash or did it make ground textures look funny or what it was, i just think it was CTD(crash to desktop) if you saved something what you didnt edit. And another warning about saving is that if your computer runs out of memory when you have painted textures on your map and you are saving those, even the editor cannot open the map after that, so as a hint take backups often when you start manually painting your textures
Edit: i didnt mean you cant save often, save as often you want but dont manually check what you save at that time, only save what the editor has automaticly checked when you press "save" button, i remember reading long time ago that checking wrong box manually might cause some problems.