Mission ID: 0214A MICHAEL Tail #: 5305 Take-off time: 10/8/18 2:20 Flight hours: 7.7 ARWO: DeHart Equipment: ​Hygrometer: Screen kept scrambling. Frequently getting "red" dewpoint values (and subsequent ///// for SLP in HDOBs) even with accurate dewpoint and sensor wetting on.  Most commonly happens in cloud at full saturation Software: Frequently got "Floating point overflow" or "Floating point operational error" boxes popup. Was usually able to just X out of a few boxes, however got cascading error at one point requiring restart of MM. Again got VDM problem with erroneous lapse rate causing unrealistic extrapolated SLP value. Attempting to change freezes MM. Starting a new VDM does not clear problem. Can find no other way around this other than to allow MM to crash and restart the program. Lapse rate issue is usually resolved after this. Problems: Hygrometer;#ARWO Computer/Software