UBB.threads PHP Forum Software Community Forums UBB.threads Installation and Upgrade Support Can't see the topics and replies

I've recently upgraded from 7.1.1 to 7.4 and everything seems to have gone correctly. But

I only see the "Quick Reply:" field when accessing a topic.

I see all the topics in the "Forum List" and am even able to post, but the view of the topic is empty. I am able to browse the topics with "Previous Topic" and "Next Topic" but they are all empty...

Anyone got any ideas?

I solved it with switching to Threaded Mode and back to Flat Mode in my user preferences.

And aplying in control Panel fixed it for everyone.