Thanks for the investigation. I will check this next week.

Kind Regards

Tony

There is a bug in the buildselect. My fixes are in red.

In 4.4.4

Line 5850:

var a, ovm = [], elem = this.elem, vl = this.vl, options = $.extend({},this.options), msl = options.multiple===true; if($.isFunction(options.buildSelect))

{

 var b = options.buildSelect.call($t,data);

 a = $(b).html();

}

else {

 a = $(data).html();

}

if(a) { $(elem).append(a);

....

elem is the <select tag>

In 4.5.2 at line 6055

var ovm = [], elem = this.elem, vl = this.vl, options = $.extend({},this.options), msl = options.multiple===true,

a = $.isFunction(options.buildSelect) ? options.buildSelect.call($t,data) : data;

if(typeof a === 'string') { a = $( $.trim( a ) ).html(); } //only happens if a is string

if(a) { $(elem).append(a);

Long Story Made Short: (My Fix)

a = $.isFunction(options.buildSelect) ? options.buildSelect.call($t, data) : data;

if (typeof a === 'string') { a = $.trim(a); }

a = $(a).html(); //This only gets applied if 'a' is a string in 4.5.2, according to 4.4.4 it has to be applied universally. 

if (a) {

 $(elem).append(a);

...