When trying to insert a sprinkler head schedule, after selecting the heads and attempting to select a point to insert the text, you get the following error;

Command:
Select Heads to put in schedule (as in by floor) or Right-Click to add all heads to schedule
Select objects: Specify opposite corner: 8 found
Select objects:
Please pick start point for schedule
Error: bad argument value: non-negative: -1
 

When attempting to define a sprinkler head, after selecting NEW SYMBOL and choosing a sprinkler head, when your click OK to set its definitions, nothing happens and you go back to a command prompt.  The defininition window does not appear at all.  If you notice grey colored text,this is also a cue there is something wrong

When defining a flexible sprinkler connection, the following error is raised ("Input string was not in a correct format"):

When trying to insert a newly defined Flexible Sprinkler Connection, an unhandled exception dialog box appears.

When trying to open the dialogue box to define a Flexible Sprinkler connection, the following message box error appears. 

Could not find file; FSC-INSERTDEFLINE.txt

While using the 'Choose Part Number' button to open HydraHEAD Selector and retrieive its description and part number, you get the errors below;

Runtime Error 713, Application-defined or object-defined error

Sprinkler not properly configured.  Please re-select using 'Choose part'

Various issues with the DETAILS layer.

missing data files in \HES\HYDRACAD\Ver50\DATA\SETUP Selecting

Missing application n/a Choose Part Number n/a

Registry bug. When the FSC command is used for the VERY first time, if the drawing is saved to a drive other than the local drive, you *may* get this error.