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

Steel offset is greater than 0 and the first point picked doesn't have any steel layers (obstruction layers) directly above it (assuming your line is running north/south) BS HydraCAD 52.03 r1

when placing a TOS defline and a item is picked to place the Tos defline. If the item has a Z coordinate then this can be assinged the TOS block. the defline will be a 0 but the blocks will be elevated (although it looks normal) this will usually raise once and then the error will occur even if you put a new defline in. tos id missing

When inserting a SIDEWALL sprinkler, HydraCAD does not ask for the rotation angle of the sprinkler head, it inserts it at 0°

Ideally, it should ask for the rotation angle of the sprinkler head;

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