Basically 6/8 spawn locations are affected by some sort of weird invisible wall. The starting workers in the affected spawn locations sometimes spawn on nearby islands. The ones that spawn on the same island are outside this barrier and when I try to move to the mineral patch, an invisible, perfect straight wall going vertically prevents them from. The "town halls" cannot produce workers saying something like "cannot find placement location" and zerg hatcheries can't produce larvae. However the Terran CC can lift off and land in the same spot unaffected by this wall. If i use the editor to place a unit inside an affected area, it can move about fine until it leaves that area. As it is about to leave, it receives a small push before being locked out.
Couple of reasons I suspect is due to me using the convert legacy map function. Also the old map is 256x256 and I notice that when converted, i had to change the camera boundaries. I dunno if the screwed anything up.

Look at the Pathing Layer ('H' hotkey I think). Do you see a red zone where you think there is the invisible wall? If so, remove it.

As far as I can tell, The map is completely empty of red pathing.

Can you show us a picture of that in editor?
Check the camera boundaries again.

If that would happen everywhere I would have guessed that you are using the lowest cliff level. But maybe that is the case.
So on which cliff level does that happen?

Strange, the problem seemed to have been resolved for the right side of the map even though i don't even know why.
This is an older screenshot with the right side still messed up. As you can see in the minimap, some workers spawn outside the main island.
This is a newer version with the right side resolved but the left side still messed up. I added bots to all slots to see which one works. now only the left side has problems. Unfortunately I cannot test all the smaller islands.
same game, showing that the CC can't make an scv.
Yes i know the map isn't balanced, its just for me and maybe friends to screw around on.

Looks like it's Map Boundaries.
Press 'O' hotkey while in terrain mode: yellow lines should appear. Anything beyond those lines should only contain terrain/doodads.
You can change those boundaries via "GalaxyEdit Map -> Map Bounds".