Subtract

Is there a maximum number of subtracts that MatterControl 2.0 allows? On some object designs that have multiple subtractions already, when subtracting another object from the main part, all that is left is the part(s) I wanted to subtract and not the main object after the subtracting. I am selecting the correct item to subtract.

I have found that I have to subtract one part at a time then ungroup so you don't end up with a primitive, then do your next subtract, and then you can pretty much keep going that way forever.