During the AutoCALC process, it gets hung up at step 5a.3b. 

Re-Ordering Pipe Paths - Phase 2

 Line / Main tags are blocking items behind the text / tags are not transparent

While running AutoLIST, the process hangs when cleaning up lines database

DAO Server - Error RSEdit

Call from 'AutoList :: CleanUpLinesDatabase (lineDB)'.

DAO Error:

No current record.

Then followed by the AutoLIST Failed!  Please run Listing Checkups

Shared Parameter (Default Fitting Assembly Code (Hydratec)) for Pipe is MISSING

When running a calc, you first get this error indicating a number of possibilities.

Then the Pre-calc Questions window pops up with a warning.

But you go ahead with the calculation anyway and get this result

Your System Has a Deficit

System is -nan(ind) psi over the Water Supply Curve

When trying to insert a valve type fitting from the parts tree, you get the error; 

Still!!! Block ### is missing.  Please insert manually.

However checking the database for the drawing file shows it exists.

Vertical pipe issue.  Switching back to Edit Mode (S2D) leaves HydraPipes in Hydrapipe layer.

Then when trying to show system model again (S3D) you get an AutoCAD message box "Please Switch to Edit Mode"

After setting specific linetypes for your piping, pretty pipes doesn't match the linetype of your pipe.

The pipe noted should show a HIDDEN pretty pipe, similar to the one below it

When attempting to Select Sprinkler (SS or SSP command), you get the error;

Point or option keyword required.

Specify insertion point or [Basepoint/Scale/X/Y/Z/Rotate/Explode/REpeat]:

Specify rotation angle <0>:

Then your sprinkler definition box will want to be inserted, rotated and each value set individually

When trying to size a pipe, the units show up as millimetres/millimeters (mm) instead of inches OR the values for half show up as a backslash