AdrianXtra these are indeed unit groups and there is a simple solution to this ;-)
I assume your unit groups where created in the 'Object Groups' dialog found under 'Map -> Object Groups...' as i do not recall dynamic unit groups to have such a problem. The solution is to go the 'Object Groups' dialog, select each unit group that produces this error and for its icon select the icon 'Assets/Textures/black.dds'. Because black in this situation means transparent, the unit group symbols on the map should disappear.
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AdrianXtra these are indeed unit groups and there is a simple solution to this ;-)
I assume your unit groups where created in the 'Object Groups' dialog found under 'Map -> Object Groups...' as i do not recall dynamic unit groups to have such a problem. The solution is to go the 'Object Groups' dialog, select each unit group that produces this error and for its icon select the icon 'Assets/Textures/black.dds'. Because black in this situation means transparent, the unit group symbols on the map should disappear.
Hope that helps!