Registration validation errors

Hello All,

Running Membership Premium

Just started having issues with user registrations erroring out with a validation page staring that the email address and user name are in use, even though the account is being properly created.

Basically the users are not logged in the way they should be.

Annoyingly, it appears to be intermittent.

Anyone ever seen this?

This is on one my main sites,

We normally use invite codes, I turne them off for now for testing purposes.