CCK3 and User Registration problem with Mulitgroups

I am having a problem with CCK3 and the User Registration module with Content Profile. I am using the CCK3 alpha specifically for multigroups.

If if a user creates a new account with a multi group, I receive the following error message on save. The account is created but the node for the profile is not created.

warning: array_keys() [function.array-keys]: The first argument should be an array in /modules/cck/content.module on line 926.

Any suggestions on how to resolve the bug?

Thanks
G