Some help please with SDK

I haven’t used the SDK and developer mode for a while, a couple of things I have noticed is that when I exit developer mode while in the game it tends to freeze and I have to close the sim with ctl-alt-del, and I haven’t been able to use the gizmo to rotate by clicking the center scroll wheel like I used to, I have also been unable to get the taxiway paths to draw the pavement, its been a while since I made anything due to the SDK being a mess, which it still appears to be not that much better. Any help appreciated