RSS Visualizer no longer shows 'Press the _ key' below headline

I recently replaced my PowerMac G5 with a Mac Pro and all went pretty well, except for a strange glitch: the RSS Visualizer no longer displays 'Press the 1 key...', 'Press the 2 key...' etc below each RSS headline like it used to. It's simply missing, but everything else works fine.

I actually use that feature, so I'd like to get it back, but I've Googled for other people with the problem and found nothing.

I already tried replacing the RSS Visualizer.qtz file in /System/Library/Screensavers/ with one from a system that works properly, but that didn't work.

Any ideas?