Sounds like a slight Opera-CSS-issue.
It's hard for us to test, I think Spearhead tested Opera in linux and didn't have the issue (right?), so there are these options:
- Use Firefox
- Change the number of rows to be displayed in the Preferences page (if it's only the Browse / Newsgroups / View files pages)
- If you're good with CSS, try to find the bug in style.css
- Or the blunt axe approach: remove the lines saying: "overflow: hidden;" from style.css
- Blunter axe approach: remove all lines containing 'overflow' from style.css
The last 2 options will probably work, but you might see more scroll-bars than normal.
Let us know which one worked