You can see it on the first page on
http://www.hackisan.de/index.php/en/
The toolbar is white like in most other themes...before it had a dark color.
In Easyblog 5.1, we did updated some toolbar structure, so the second layer, it will display white color now.
Can you check my attached screenshot below and see is it your previous style is like this?
If yes, I will provide some of the custom css so you can apply into your custom css file.
On preview pages like the frontpage all html like links <a href="http://www.domain.de";>, embedded youtube videos, <br>, <hr>, <center> is not displayed anymore.
When you open a post everything works fine. Inside a post everything is displayed correctly.
The reason why it didn't show properly blog content format on the front listing page is because you have enabled truncation setting, so it will remove all those HTML code on the front listing page.
I have a question, may i know blog listing page you didn't enable truncation setting in your previous version?
If yes, mean the blog listing page it will show all the blog content on the page as well right?