In Max 2015 Autodesk has introduced several changes in the Nitrous system, and one of the functions used in the points-cloud mode is broken. The bug is reported to Autodesk, but is not solved yet.
For this reason, we have included a workaround specifically for this version. Although it should work in most of cases (we have not detected problems in our tests), obviously it's failing for you.
Please, would you give us some details about your configuration ? (video card, version of drivers, etc.). I'm afraid we cannot do more until the bug is solved, but we'll try it.
I apologize by the inconveniences.