Hello Ulli,
I've tested it with new articles & it works, and I've also realized that I was testing it with MyBlog (modified) articles & not standard Joomla content..... so my problem is only with MyBlog.
In a nutshell, the component seems to be working perfectly with Joomla content articles (I haven't sent the articles to Twitter or FB yet but I'm sure it will work)
EXCEPT for modified MyBlog articles (...new MyBlog articles are being stored in AutoTweet NG Pro messages list, ready to send).
I have included a screenshot of the MyBlog plugin parameters..
By the way, as the main Joomla content is working I am not in any mad rush for a fix, so no problem, take your time (and if you needed to look at it on site just email me & I can set up an account for you, but as I said, there's no hurry

) - Regards, KB