Cumulus Support

If I shutdown my Instromet station and restart, Cumulus calculates an erroneous sunshine total, i.e. it does from the correct total, say 4.2 hrs, to -112 hrs. I don't mind this being a querk of the program, but the problem is I can't find a way of removing it from the graph showing sunshine hours.

Can anyone suggest a solution. The graph below clearly shows the problem.

The daily totals are in dayfile.txt, so you can edit them using the dayfile.txt editor in Cumulus. To get the graph redrawn, you would then need to restart Cumulus. If you zip up the diags folder and attach it, I'll see if I can see why it happens.