You have to add a "wait 0.0 seconds" between your cleanup and the new spawn of your units. With this, the game waits until the old units are removed before spawning the new units.
Added conversations! These are meant to facilitate the story with tidbits of lore and background information for those who like that kind of stuff. Minor thing, I know, but a lot's been going on dependency-wise.
I'm also going to be investing some time in learning how to make data wizards and post them for public use. If you haven't already checked out the community project proposal thread, I would highly encourage you do so here. However, now that summer's come back around, I should have more time to work on more things at a time. :)
I liked the Jarban Minor doodads with this texture set. I switched out the rock texture for the port city 6 texture as well. I used the description of Antiga Prime and looked back at the Starcraft 1 Maps as my guide.
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You have to add a "wait 0.0 seconds" between your cleanup and the new spawn of your units. With this, the game waits until the old units are removed before spawning the new units.