Hi,
I just tried it out at work to see if the bug was also on my pc there. And it is. So it can't just be some setting on my pc. Here is what you should do to replicate the error:
1. Go to the top of this page.
2. Click with the left button on the mouse on the text "There seems to be a strange scroll error in this forum" in my first post.
3. Leave the mouse and do not touch it anymore.
4. Now try to scroll down the page using the ArrowDown on the keyboard (do not use the mouse). It can't be done.
After clicking on some of the text in a post it is impossible to scroll down using the ArrowDown key.
Best regards,
Jeppe