problems is that the mouse pointer turns into a black square

I have got four Plugable DC-125 USB 2.0 - running with multi point server 2012 , the problems is that the mouse pointer turns into a black square, is this a power issue? do I need the extra power supplys?

Hi Dominic
No it’s not power issue, it’s our driver bug.
We’ve identified the root cause and fixed the issue, could you please download latest driver from http://osbase.com/wms2012driver/ and verify ?
Thanks
Kan
http://osbase.com