In the summary buffer or the article buffer, SPC is bound to
`gnus-summary-next-page', and it should go to the next article if
reached end of current article.  However sometimes it doesn't jump to
the next one, and I need to press `n'.  It usually happens when the
article is very short --- less than one page.  But sometimes (rare) it
also fails on a relatively long article.

My `emacs-version' is "23.3.1", should I update it?

-- 
Carl Lei (XeCycle)
Department of Physics, Shanghai Jiao Tong University
OpenPGP public key: 7795E591
Fingerprint: 1FB6 7F1F D45D F681 C845 27F7 8D71 8EC4 7795 E591