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AutoCAD Based Piping (Ribbon/Toolbar/Location)
Description:
Double-Clicking on a riser nipple, or using the Edit Riser Nipple command (ERN) briefly displays the edit riser nipple dialog, which then closes
Dialog is likely opening off screen
In HydraCAD V57.07 Rev1/58.01 Rev1 or newer, type in DDL (Display Dialog Location) and press enter. Dialog box should now show up in default (upper left-hand) screen location.
Earlier versions:
See this Autodesk link helps explain what to do: dialog off screen