[Koi]

This happens to me also. I noticed it would alway kick me to desk top or do the black outline bit between 5 to 10 min into the build. This seem to happen mostly when the view object window is open,adn one is trying to place objects using waypoint. Sometimes the black border will flash in time with the waypoints. It also happens when it is not opened but a lot less frequently. I noticed that if I placed an aaa gun down first it seemed to take longer before the screen would freeze, about 20 to thirty min. and the bigger the mission file got the more stable it became , but it still would crash. The only solution I found was to save frequently and the place objects on the map and then copy the placed objects from the map instead of opening the view object menu. I also noted that there seemed to be a bit of a warning sign just before it would crash, the mouse started tracking more slowly. If you see that happening or only think it is happening save now, not one second later but now!

The other thing you should note is that if you use any objects from the FMBplus when making a mission you must always have it activated from then on or it will not save the map, but if you do not use anything from the FMBplus you don't need to have it active in order to save. This is because the FMB+ has a different set of objects that are not found in the standard FMB and this creates the same kind of situation as when objects are missing on a new installed map, it won't save. This can be really annoying if you forget to activate FMB+ and spend a lot of time on a map only to lose it all.