1. top of structure blocks have disassociated themselves from the top of structure definition lines. unhandledexception

Old or invalid plotters and plot styles (believe it or not) Slow Opening/Using Slow

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

Running an AutoCALC, it hangs at step 1a.3 while attaching fittings and you get a Runtime Error 5

Incorrect Support File Search Path folder locations Error dialog box insert fitting

Duplicate Reference Points with jump detour

Process is crashing out because an old vertical pipe block is in the drawing DRYVOL or DV HydraCAD V50+

If the user runs the sprinkler head schedule, the dry volume text window will not appear. DRYVOLU or DV HydraCAD 52.03 r1

Hydrapipes apparently use Standard as their Style and the menu macro no longer changes Standard, only the Style named Hcad

V45 converted to V50, the hangers show up in list but no cut dimensions on drawing

nil

The last sprinkler head setup as sprigs on sloped pipe will most likely show a cap length shorter than the 'flat' length. For instance, a 3" capped pipe is returning from 3D as 2" rather than a longer length. n/a Plan View n/a

Program has become "tired"

Drawing zooms out to expected isometric view as if 3D System Model has been completed. No 3D Pipe can be found. Unknown cause No 3D Pipe Seen All

1. Video Driver out of Date -or- 2. AutoCAD MEP has a .dbx file interfering with our drawing HydraCAD

The CURRENT LAYER in the drawing is LOCKED. Show System Model process stops on Step 13 of 28 while adding RN Fittings to the drawing. Picking the 2D Switch to Edit Mode button removes the Hydrapipes and the riser nipples. Show System Model HydraCAD V51

AutoCAD Support file search path is pointing to extra, incorrect paths. Usually caused by migrating settings during install rather than running a clean install. n/a HydraCAD v53 - Acad 2016

1. Important layers locked or frozen. 2. User had OPHEAD block in ACC1 layer Internal error