Sc3-plugins DWGBowed seems unstable?

Questions
1 
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap nan fb 0
slip 1 failed2  Z 0.55 vdeltap -5.23869e-10 fb 0
slip 1 failed2  Z 0.55 vdeltap 1.28057e-09 fb 0
slip 1 failed2  Z 0.55 vdeltap 8.36735e-10 fb 0
slip 1 failed2  Z 0.55 vdeltap 4.53838e-10 fb 0
slip -1 failed2  Z 0.55 vdeltap 1.82968e-09 fb 0
slip -1 failed2  Z 0.55 vdeltap 1.92063e-09 fb 0

… is a pretty typical transcript when I try to run DWGBowed synths. The first part, with nans, is catastrophic (and when it happens, it dumps thousands of lines like this).

It seems less troublesome when “pos” is closer to mid-string. It happens more often when bow pressure has a slow releasing envelope.

I’m not quite clear why it happens – can anyone give some advice perhaps on parameter ranges to avoid? (Would be nice at least if the nans could be suppressed.)

Thanks.
hjh