No error, but when opening the file menu and opening Revit, the program freezes or stutters anywhere between 10 seconds - 1 minute. 

Coupling do not show, display, print, plot and are not visible in any fashion in plot views with display detail set to coarse or medium.  Was reported by Davis as :  the couplings on long runs of pipe don’t show up in our plot views. No matter if we use medium or course detail level.

Data in file (filename) is corrupt and needs to be manually recovered.