I recently have noticed that the Dew Point graph on the main display and index.gif will ocassionally simply go straight up and off the graph for no apparent reason and stay that way for some time.
hi
go to setup, graph setup
then click on down, for lift/lower temperature
that will fix it
(its just that its getting to plot off the bottom of the scale, and then that causes a overscale problem (the acual data is OK)