When trying to use masterwork studded armor (both the hard coded, and the custom iterations), the armor check and max dex are not translated to the char sheet properly. I've attempted it with the hard coded version found in the light armor proficiencies, and by creating custom armor, using the modifier. In both cases the char sheet shows armor check and max dex of a regular (non masterwork) studded leather armor. I don't know if this bug is applicable to other scenarios.
Attached is a copy of the build in question.
Win 10, win 8.1
Thanks for the character file. Makes things really easy to solve. This is not a PCGen code bug issue.
You've activated the "Encumbrance is Medium" rule, which imposes a Movement Reduction as if you are wearing Medium Armor, and also penalizes you with a -3 Armor Check Penalty. Your character is currently carrying too much weight. 38.5lbs of the 38lbs allowed. Regular Studded Leather only has a -1 on the Armor Check Penalty, not a -3.