When drawing objects, you get these funny icons/images next to the drawn object.  If you hover over it, it mentions an osnap option

Poly lines and leaders etc. appear to be hollow.

Runtime Error 53, File Not Found HydexVB.DLL Transfer to HydraCALC

Runtime Error 5 Invalid Procedure Call or Argument 

When clicking the abacus to enter a length, you get this error;

Unhandled exception has occurred in a component in your application.  If you click Continue, the application will ignore this error and attempt to continue.

Index and length must refer to a location within the string.  Parameter name: length

When clicking the abacus to enter a length, you get this error;

Unhandled exception has occurred in a component in your application.  If you click Continue, the application will ignore this error and attempt to continue.

Index and length must refer to a location within the string.  Parameter name: length

When plotting two viewports, one with center-to-center lengths, and the other with cut lenghts, the riser nipples/vertical pipes will show both, even if your layout tab looks fine.

LAYOUT TAB

PLOT PREVIEW

When clicking the abacus to enter a length, you get this error;

Unhandled exception has occurred in a component in your application.  If you click Continue, the application will ignore this error and attempt to continue.

Index and length must refer to a location within the string.  Parameter name: length

Attempting to redefine a sprinkler head with the string 'flex' in the name/description will crash with a BAD SSGET error message if the sprinkler was not set up as an older style HydraCAD flex head

When trying to insert a sprinkler head, this window pops up;

Pick head insertion point. Pick any point besides endpoint to break into pipe. Can't find file in search path