Yes, have the same problem
If I look in the database everything is installed correctly only usergroups is empty. I know from my previous version that there are values in the usergroups (Administrator, Banned etc.... ) and they are not there anymore.
I use the internal Photopost user registration system (no forum software) and have this problem with version 4.8.2 and the lastest beta 4.8.5b3
And after I filled in the Photopost user registration (final step) I receive this error message:
Error: Column count doesn't match value count at row 1
Error: Column count doesn't match value count at row 1
Error: Column count doesn't match value count at row 1
Error: Column count doesn't match value count at row 1
Error: Column count doesn't match value count at row 1