Pro Sites "No Gateways Enabled"

Pro sites isn't letting me choose a gateway for the payments page. When I select "enable gateway" on the gateway page, nothing happens and no option is provided to select the gateay.

All plugins are inactive.

I attempted to delete the databases containing pro-sites data, but I guess there are other options that I can't find. It would be great to know where those might be, it'll likely resolve my problem

Thanks
Rob