When trying to select Pick Light, this error shows... Sequence contains no elements

When raising to 3D (S3D command), you get a yellow circle with the message "Takeout of fitting does not match takeout expected for a "??????".  Change fitting of fabrication method"

When trying to insert a Hydraulic demand block (Compact/Standard/Expanded) (IHD command) and after selecting the .WXF file to use;

You get the error message;

Error: bad argument type: numberp: DATAFILE

And the command kicks you out.

When trying to insert a specific fitting, you get the error

Could not add this part to the fitting because of missing endprep

then;

AutoCAD Error Aborting

INTERNAL ERROR: !dbentapi.cpp@719: eNullObjectld

One or more toolbars cannot be found after selecting a menu or command.

This happens because the toolbar is being opened 'off screen'. This usually happens when the computer has a dual monitor but the 2nd monitor isn't currently connected. 

After calculating system this message pops up..."The specified remote head does not have a k factor. Please fix your input" hydcalc.exe

Step 5a.3 "Attaching Elevation of ~ to Node ~~~~

Step 5a.3 "Calculating"

"The specified remote node does not have a k-factor. Please fix your input."

"Calculation failed for unknown reason"

The View button that appears after running a calculation does not do anything

Or you get the error; C:\Windows\system32\Write.exe

'file name asked for does not exist!

After raising to 3D, you see green lines extending from (0,0,0) to points on the drawing

You can erase the green lines and continue on, this is an annoyance and inconvenience but not really a problem.

When Retrieving MEP content this error occurs... Revit encountered a Attempt to modify the model outside of transaction