vBulletin changed Social Groups with version 3.8 of their forum software. We needed to upgrade in order to implement many of our new features so that upgrades in the future would be doable without major problems.
Like most secondary vB features, Social Groups are pretty shitty. John had to do a major overhaul to the blog system to make it not shitty. Looks like the vB team managed to make make Social Groups even shitier with the latest upgrade.
The good news is that Social Groups now adds the abilty to create multiple theads in your groups, basically turning your group into a mini-forum. The bad news is that you seemed to prefer the previous layout of having only one giant thread, with the new posts appearing first.
We will make some changes to the Groups so they suck less, but frankly, they are fairly low on my list. However, to make things somewhat less painful, we will add a Groups section to the main site navigation very soon. I also look into finding a quick fix with some pre-existing mods/hacks.
Thanks/Sorry