The piping insulation feature is killing me. When you add insulation to a transition, elbow, or tee it makes it larger, thereby overlapping the connection piping. It shows them as connected, but it doesn't look like it. If you drag the overlapping end of the pipe to try and reconnect it it deletes the insulation on your transition, elbow, or tee. Actually if you try to connect any piping to a transition it deletes your insulation. So the only way I've found is to draw the insulation, so it overlaps, then if you move one of the connecting pieces it will stretch out and the connections will line up. However, this also shifts the connecting pieces because the pieces get longer with insulation, messing up the location of everything nearby it. I've re-done my chases about 6 times now because it keeps on moving them for no good reason.
Fix this. Now.