When importing a Persistent Model into Revizto, none of the riser nipples are visible

When reading a Persistent Model drawing in Revizto, the units are not correct

Exporting a Persistent Model gives the following message.  More than like the PM drawing gets saved anyway.

Cannot Save!  drawing path and filename might be OPEN.  Pleace (sic) close amd (sic) try again. 

*Should be "Please close and try again"

The lines or mains do not get the pretty pipes applied. The layer is all lower case. Lines or Mains missing

Duplicate objects are on the drawing and Acad can't write an identical object to the hash table. n/a Dialog Box 53.01 r2

unknown, this shouldn't be happening n/a Navis model n/a

1. there are 3d solids in the drawing that have no geometry. Persistent Model

When trying to open a drawing file, you get this error; 

DAO Server - Error DBOpen4

Call from 'hcad_fignames'.

Path:'C:\HES\HydraCAD\Ver50\AutoListElements\Data\Setup\MdbTRANS.mdb'

DAO Error:  Unrecognized database format

C:\HES\HydraCAD\Ver50\AutoListElements\Data\Setup\mdbtrans.mdb'

When you click OK, AutoCAD crashes out

When opening AutoCAD, you get an error saying "a software problem has AutoCAD to close unexpectedly"

Upon reviewing the file it's crashed on, it shows HCAD_MAKEFIGHANGERLIST as the culprit

After opening AutoCAD and a drawing, you have a dead area where you can't draw nor does anything display.  Usually next to a compressed palette.  Note in the image below how the crosshairs do not extend to this area.