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AutoCAD Based Piping (Ribbon/Toolbar/Location)
Description:
When attempting to insert a pipe dimension you get the error "Invalid option keyword"
And the command prompt says "Enter an UNDO control option" with the dialog showing your choices
Unknown but started happening after getting an Unhandled Exception error for an entirely different command
Save the drawing, close the drawing and AutoCAD, then re-open Acad and your drawing.