The 41b version I uploaded on Oct 8 included fixes for Mobs with Riders.
You must have an older version.
Hopefully they change their minds or patch that, because that's going to break every single custom thing that uses stacked entities. >.< "Fix....boats? Do they mean let two people ride an even more broken boat at the same time?"
Awesome! I had been looking for a map like this, but was thinking "aww man.." when I heard it was only 1.9 compatible.
I've been spending a lot of my time lately messing with resource packs. Mainly trying to separate out my customized textures into separate resource packs then overlapping them, instead of having to tweak them every single big patch. So it's like dokucraft+Kingdom of the sky 2 custom textures in a separate pack and so forth. This is great to make sure it's all working properly.
Also: Playing your Diversity 2 map right now and loving it! Though I am having to burn this hint book right through to get through these puzzles, it's really that I'm just terrible at them.
You can still get the 1.8 version of the map too. There's also a 1.7.4 version.
The Meaning of Life, the Universe, and Everything.
Yay! I can make sure my texture pack has everything retextured! It's nothing fancy (just a personal pack), but it annoys the heck out of me to have that one odd thing untextured (e.g. compass, clock, and other items that aren't used much in survival).