So in the map I'm currently working on, I've had to make some logs out of 16-sided circle brushes. The problem is, every time I open the map it says "you saved your map with x number of invalid solids. Resave map with solids removed?" I of course save it and then open my map to find my logs gone. Is there any way I can prevent this from happening? Or should I find a new way to get this same effect?