All building dimensions are inserted into an different layer than the current one.

Dimensions are visible in paper space but not in model space.

When running the Line Couplings command (LC), you get the error, "No branch lines found crossing the line(s) you picked", even though it's 100% a fact the lines are intersecting

When running the Custom Coupling command [CC], the tooltip which follows the crosshairs duplicates the Command Line text, it does not show the drag distance and angle from the origin

The tooltip would be more useful if it showed the distance from the start point

Pipe Diameter does not get adjusted. New pipe not sized.

Error: bad argument type: lentityp nil

No error message but cutting in couplings breaks the pipe but does not insert the couplings block.

The diameter tag HANDLE is 0000 this number is used to determin if the pipe is sloped - yielding an incorrect pipe length. Move Line / Move Main make the diameter tag HANDLE be 0000

Program has become "tired"

Interestingly PDMODE is set to 1. This means that there is no node point at the insertion of these sizes, so the sizes are not found.