invisible images when scaling

[Jose Martinez]

hello,

When scaling in my app while units are moving through PathTransitions they start disappearing or flickering, or both.  This time I got code to reproduce. 

Jira 23351

Hopefully its user error.   In the past things like this were caused by passing NaN to some node for something or other.  In this case I do not see that happening, but maybe I am missing it.... will keep checking for it.

thanks 
jose