Hi all, I have 2 hives from previous year, one is two supper deep and another hive is only one supper. I added to each hive a medium with frames and start foundation. The problem I have that bees not building any foundation in the medium. I installed the mediums at the begining of April and since then no activity at the medium.Both hives were full of bees. The hive with Two deep, it swarmed 3x already and they had plenty room to move up and build the medium, but they did not. Same problem with the other hive that has only one supper and medium on top - it swarmed 2x and the medium was not touched. Can anybody explain what is the problem? and what should I do to fix this? Thanks for any responses.