Im getting the same message different line.(770) However if I click the post groups tab again it appears to have added. I only had one other plugin installed, w3, and I disabled it but it made no difference.
Now it shows up with my posts saying that they are not in groups. And on the mainpage it displays one post. after I go through and set them to to the mainpage group they show up normal again. Im not sure what the error message was for
