I'm seeing some odd table breakage on both the front page and the forum thread list pages. Sometimes it's the "Current Events & Politics" and "Internet & Computers" forums in the same row, sometimes it's the "I & C" and "Print". The "Pro Wrestling Forum" and the header row for the "Other" section are doing the same thing.
In the forum threads view, the 10th and 11th threads are in the same row with no divider. Same thing again 10 threads later.
I swear it was happening earlier with both Firefox 3.0.11 and 3.5 under Windows, but now I can't recreate it. Under Mac (Tiger), Firefox 3.0.11 and 3.5 are fine as is Safari 4.0. I haven't tried IE8 yet. Linux Firefox 3.0.11 is definitely affected.
I've cleaned my cache and restarted my browser multiple times to no avail. I use the "Greens" theme, but when I log out the same thing is happening.
Any chance there's been some changes in the last 12-24 hours?
Interesting. I used the Pearl Crescent PageSaver add-on to do those "screenshots" and selected "Save Image of Entire Page".
I ran upstairs to do a standard screenshot and discovered you were correct: I was one level of font size (control + mousewheel) lower than I should have been. Interesting that that appears to break table rendering, but whatever.
Thanks and sorry to bug.
EDIT: control + mousewheel (or control + dash), not click + mousewheel. Just confirmed it happens in Windows too.