Ok, I now know that apparently the Blog Types plugin is not compatible with Buddypress. Here's the story:
I had an existing site and some old WPMU plugins installed from ages ago, all worked fine. I then had a bit of custom coding done for me, so that adverts are served that are relevant to the type of blog, ie, it uses the submitted blog type to determine what ads are served.
Then I wanted a publc gallery so I added buddypress.
Now, too late, I realise that my ad serving is now screwed as the plugin is not compatible.
So my question, begging, is can it be made compatible, and if so, is it easy or would it take a complete re-write? Any help appreciated as I now have a ton of custom work up in smoke unless I remove buddypress and the gallery plugin I paid for!