Jay,
If you look at the top of the summary file:
165 Monthly Min: -17.777779,12/8/14
165 Yearly Min: -17.777779,12/8/14
166 Monthly Min: -17.777779,12/8/14
166 Yearly Min: -17.777779,12/8/14
this -17.77777 etc seems to recur through years on the data files, i changed the database to a new one yesterday and looking back through the previous one it's there all the time in the CF & CG columns in the comma sep excel files stored in c:\vws\data but not in the new file i created yesterday, however i have noticed that the one i renamed yesterday is 39mb but only seems to contain data for a few months, it's lost or over written data from Later 2010, 2011, 2012, 2013 and 2014 (before yesterday), had corrected the database almost every time i had loaded the prog since i can remember
Hope this is some help, let me know if you need more info / files etc
Regards
Trevmm