I have a 2007 db, been working no it in 2007 and occasionally in 2010, careful not to use any 2010 items. Well I goofed and added a Navigation Form (2010 only) and then deleted it. Now My 2007 db opens in 2007 fine, everything works, but the glowering Warning message and lovely yellow yield sign show up constantly. How do you resolve the incompatible items and clear this warning?