I am using MEP 2009, in plan view i can see mechanical trades pipe and sprinkler pipe. When i take a section view of that area I can not see the whole run of pipe i only see bits and pieces. I believe the other trades are using 3rd party programs but not sure. Actually the sprinkler pipe is a line that has been extruded. thank goddness for 3D! Is this an enabler problem or do i need an add-on?