When trying to insert a riser nipple/vertical pipe, you get a FATAL ERROR:  Unhandled Access Violation. 592A00h or 8B2A00h

No connectable heads found within distance specified for the line

illustrated, or heads were already connected ...

No connectable heads message comes up, even when there are obviously heads that can be connected. Can also be error stating Please re-select line away from other lines

Inserting a pipe dimension (pipex) places it at the end of the pipe, including its center grip or not even on the pipe at all

See solution #3 if the PIPEX is not on the pipe

1)missing pipe x block 2) bad block Command Prompt AutoCAD 2009,2010

stacked rn connects to first pipe and misses second pipe leaving a pipe going up to nowhere. this is caused by a floor boundary with a negative elevation adn computer generated VP

Path/File Read Error

Somehow many of the pipes got a very small numbers in its Z-Coordinate value n/a Drawing Area Autocad 2010+

no error but all values are blank in the pipe schedule

Riser Nipple center to center and cut dimension properties are both on the same layer. Turn off SPRKDATB and cut dimension does not turn off. SPRKDATB layer did not exist when riser nipple was inserted or a V45 template was used to start the V50 or V51 drawing or drawing was converted from V45 to V50 or V51 HydraCAD v5x.any

Master drawing is not a HydraCAD drawing, so the riser nipples get displayed as the default, which is metric Xrefs