I have the filter setting set to true currently. If I remove the priority mail option and just check all 3 first class options, first class shows just fine (only one first class). I set it to log into the cache folder and attached 2 log files : 1 where all 3 first class are picked and it works and 1 where I choose just the 1 first class and nothing shows.

SHIP_usps_Debug_01292014121553_US_32757_0lb_4oz.zip