Error with SET mouse.x and mouse.y

Hello, I'm having an error in a certain computer with "Chrome v.51 and Windows 7" when trying to SET 'mouse.x' and 'mouse.y' from a javascript function as follows:

$(document).mousemove(function(e) {
	parentOffset = $("#krpanoSWFObject").offset();
	relX = e.pageX - parentOffset.left;
	relY = e.pageY - parentOffset.top;
	document.getElementById('krpanoSWFObject').call("set('mouse.x',"+relX+");");
	document.getElementById('krpanoSWFObject').call("set('mouse.y',"+relY+");");
	document.getElementById('krpanoSWFObject').call("trace('MOVING POINTER...',mouse.x,'/',mouse.y);");
}).mouseover();

Getting this Error in the krpano console log:
"Calling action 'set' failed! ReferenceError: Error #1074"

Also tried with this function:

$(document).mousemove(function(e) {
	parentOffset = $("#krpanoSWFObject").offset();
	relX = e.pageX - parentOffset.left;
	relY = e.pageY - parentOffset.top;
	document.getElementById('krpanoSWFObject').set('mouse.x', relX); //--------> THIS IS A DIFFERENT LINE
	document.getElementById('krpanoSWFObject').set('mouse.y', relY); //--------> THIS IS A DIFFERENT LINE
	document.getElementById('krpanoSWFObject').call("trace('MOVING POINTER...',mouse.x,'/',mouse.y);");
}).mouseover();

But now I get errors in Chrome's Javascript console:
"Uncaught Error: Error: An invalid exception was thrown."
pointing the line with -> document.getElementById('krpanoSWFObject').set('mouse.x', relX);
And so, Javascript sequence stopped working.

I've tested with (Internet Explorer/Windows 7/Same computer), (Opera/Windows 7/Same computer), (Firefox/Windows 7/Same computer), (Chrome v.51/Windows 10), (Chrome/OSX 10.11), (Safari/OSX 10.11), (IOS 9.3.2/iPhone/iPad)
with no errors in all those systems

I have deleted the browser cache, also tried reinstalling Chrome, obtaining the same errors

What could be happening ?

Thanks & Regards!