I have had my hive a couple of months now, and as I explained in another post, it's an old hive. anyway, these hives were in long grass, and thus had restricted access to the entrance. Bees had started using a small hole at the top of the deep (thus space between deep and super) as their entrance. It's about the size of 2 maybe three bees, and causes a bit of congestion when foraging bees return. The bottom board entrance is now completely clear, but the bees refuse to use it. I guess they are creatures of habit. If I were to block off the hole at night (when all bees are in), would they start to use the proper entrance? Does it matter?