Now event the "Settings" menu in the Admin of e-Newsletter only shows a white page... no more settings! So not only the previous things I mentioned do not work, but even that does not work any more.
I have given you access to my website, with the prior approval of my developer, at the condition that you look but do not touch anything without his prior approval.
PS: By the way, I had a lot of difficulties to send you this question, and did not succeed from your plugin in the admin of my website. So it seems there is also a bug with your support system or your plugin in my website...