DDP and layer coordinate system

Discussion created by geoladie74 on May 2, 2012
Latest reply on May 4, 2012 by jbarrette-esristaff
I have been using Arcview 10.0 to develope multiple map layouts (data driven pages) for the last year.  I have had no problems until this week.  Suddenly, whenever I refresh my DDP, it changes my layer coordinate system to a system that is not used in my map, is not referenced anywhere, and has never been a part of my map.  It also causes my map to loose all it's data since the new system is nowhere close to the original.  I started all over, using data with the same coordinate system and it still happens.  If I change the layer system back to the correct one, my data returns and all is pretty, but I can't move from page to page.  If I refresh, it happens all over again!  Please help me figure out what is happening!