If you want to display node number or some other things for the mid point of elbow(You can check the coordinate of mid point in pcf file for its correctness). Isogen dlls will break 90 degree bend into two 45 degree bends, so there is space for mid point. This is done automatically by Isogen dlls. So the solution is to un-select the check box for elbow mid-point.
For your second problem, the manual modification of pcf file is probably not enough, send your "*.C 2" file and more details to my E-mail, I can find it out.
Regards,
Shawn Zhong
Engineer/Developer
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine
Shawn.Zhong@intergraph.com