[@bbp-fan Participant 12 years, 11 months ago]

Hi Robin, thank you for your patience!

I have a child-theme in wp-content/themes/myTheme. Inside is MY style.css. Here I have copied all the passages from the bbpress.css that I wanted to change. It has always worked fine! Just changing the font size in the forum-title and the topic-title is ignored. Despite !important.

You also can check a topic-title in bbpress with Firebug. I did ​​it like this: highlight the topic-title, mouse-click (right) and then check by Firebug.