I have the same problem with WDM-PHasar tool, also freeware from Optiwave. Sometimes it works, mostly not. We have tried all, different computers, different versions. I also bought a months license for OptiBPM since WDM-Phasar was a part of it. Unfortunatelly, WDM-Phasar is not included in OptiBPM any more, so it did not help at all. I gave up.