Please navigate to Dashboard > Forums > Tools > Debug > Error & Issues sub-tub and let us know what errors you see. And please follow to this topic and provide feedback for each point mentioned there:
Hello there !
I fixed all the problems… It came from my IT hoster (OVH)
many problems with OVH/Wordpress. I solved the problem with "Post SMTP"
I hope the new release is secure.
Thanks anyway, i'll come back soon