Right now, the toString() of WindupVertexFrame returns v[12345]. This does not help at all, so if some vertex fails to have some property that it should have, you need to write some debug code to see, what is inside and run the test in debug mode with registering debug point (at least I do it this way). For example:

String p = myFrame.getSomeProperty();

This slows things down, not speaking about if that is actually edge and you find yourself writing 6 lines of code just to see what is inside.