In case you didn't pinpoint it yet, I think I read somewhere that this is actually a unit group issue. If you have preset unit groups then they should have an icon, which looks like the broken egg. If this is the case, you can go to Map > Object Groups, and then make sure all of your unit groups have their icon set to black.dds (Which I believe is alpha channel, so it shouldn't show up on the minimap.
Hello all, I am looking for more people to play and test my campaign, which as of now I am resuming work on. The main focus of this campaign is to provide a fun, complete, and unique storyline for people to play through, all while improving my abilities in the editor to get better. All the details can be found on the map page (Link in the signature)
Any feedback can be left here or on the map's page. All constructive criticism is welcome and encouraged.