4 minutes ago, Antti said:I had / have the newsletter issue with PS 8.0.4 - I did not realize this before biker1947 mentioned this in their post as only then did I test it. I unhooked from "actionNewsletterRegistrationBefore" as you instructed and that solved it for me. Thank you!
Hook back again and up module ver. to 1.0.5 I found the problem and fixed it.