Possible bug.  The POST does work for most of the input I'm passing, but failing under certain cases.  Would prefer to PM the details as it's a specific case that is not working and I'm not really sure what is causing it, so best to provide the actual REST POST data and the subsequent query being created by the IPS software that is failing (as seen in the System Logs).  Will also provide a working case for comparison.

Sure, send me a PM and we'll take a look.