There is a problem with dry hopping from old recipes opened in 3.1. I have some that have dry hops listed for 5 days, which was all you could specify in older versions. When I open these recipes in 3.1 the dry hops are listed as "dry hop for 5 days, 3 days before bottling". Since the previous versions didn't specify when the dry hops were to be added, I don't know where the "3 days before bottling" came from, and I'm not sure what the default should be, but that isn't it!
--GF