When it comes to making excellent missions for your XWA game, AlliED is the editor to go with!
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Actually, I'm a little biased, as I was a beta tester and I watched it go through the changes. Most bugs have been worked out, and if there are any left, they really haven't been found yet.
As for things to watch out for...
Do not start a mission with a bunch of FG's and then add in all conditions and arrivals and orders, as this will mess you up. Since you have all the FG's in already, and then the mission doesn't work, you'll be hardpressed to find your error. Always start with a minimal amount of craft, and add in more as you move along, making sure everything works the way you want.
To make briefings work, you have to name your mission file correctly, or you can be booted to the desktop quite easily.
Sometimes, on some systems, if you put a backdrop in any team 'other' than Team 10, the game crashes when you enter the region that the said backdrop is in. This 'game bug' is tempermental with user machines, and not the mission maker, because some people have never had these probs. I did, and so did Troy Dangerfield.
Do not try to make a bunch of missions at the same time. Do a layout of a storyline that you want to do first, and write it out on a piece of paper...etc. Then make one mission at a time.
You'll most of the time never catch all your own errors in any given mission, so beta testing help on the net is essential in most cases.
Overall, there really isn't a downside to AlliED. Just take your time, look at existing missions, and you'll do alright.
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