Hi, are you sure the plugin has bugs and it’s not a configuration problem in your blog? About the double profile edit the page where the profile is appearing twice, what’s inside?
And in the subscriber profile configuration panel, what’s configured? Have you changed the defaults? Which is the site where I can try to subscribe and edit my profile?
If you provide more information we can help.
What do you mean with “is not possible to edit the text of a newsletter”? Are you using the composer or a theme? since there are tons of users composing and sending newsletters and we have not bugs like yours reported, it could be a conflict with a third party plugin. Again, to check problem like that we need at least a screenshot or a clear description, step by step on how to reproduce the problem.