Certain tools not working?

So I'm sure it's something simple and I know I've had this happen before. But I thought I'd ask around anyways. I'm building a few models in Constructor for a small city project and while working on my street lights I got to a point where my sphere tool wouldn't work. Or the sphere won't show up. It shows up while I'm dragging it out and creating it's size. Then when I create it it's gone. Is there a limit of how much constructor can support? I've gotten it to create it a few times by other means. But then when I try and change its size it disappears. My guess is there's a limit to it's memory? Just was hoping someone would explain it to me.