I've spent some talking with a member of DNN Corp this morning about some various issues and questions with Active Social. One problem is with Host Accounts. Keep in mind that Active Social depends on the DNN Profile for all profile data.
A host account does not use the profile data for the portal. This means that a host account will not be able to participate in groups. I don't see this as problem because I have always recommended not to use Host Accounts for normal participation within your site. However, I know this question will come up. The answer is Host Accounts are not supported for Profiles or Groups within Active Social.
We were also having a few other issues that we were trying to workaround. The best option is for us to raise the minimum DNN version from 4.5 to 4.6. We are still testing to make sure 4.6 contains the code we need. Hopefully we will not need to go any higher.
Thanks,
Will