To minimize the abuse of some holes in the site vacation days, Fencer introduced some new rules on how vacation days work. (Can read more about it HERE)
Quick overview: When a person renews a membership, they can only get 10 (or 5) additional days added to their account - instead of the old way of up to 35 extra days. Also fixed bug of a member setting a lot of vacation days, then dropping membership levels and still keeping those days already set.