ComboBox dropdown not working in IE10 (ver 4.51)

I have the following code:

<link rel="STYLESHEET" type="text/css" href="dhtmlx4_51/codebase/dhtmlx.css">
<script src="dhtmlx4_51/codebase/dhtmlx.js"></script>

I cannot select the values in the combo box using the arrow in IE 10. Chrome, Firefox and Safari seem to work. The only way to get to the values is to use keyboard navigation (ie arrow keys). If I change the path for the .js and .css files to earlier 4.x versions of dhtmlx, the problem goes away. Bug in 4.51?

Hello
It works fine locally with provided code sample on 4.5.1 (both standard and pro) in IE10 on Window 7

Odd. I have tried on multiple machines here:

Win 7 + IE 10
Win 7 + IE 11
Win XP + IE 8

On all machines, I cannot get to the drop-down items using the arrow (ie via mouse). I have to go into the combo box text area and use the arrow key to get to the items.

When I change the dhtmlx paths to 4.1.2, it works properly on all machines. But 4.5.1 and 4.6 versions do not work. Anything else I should be looking at?

Adding:

Solved the issue.