I use Quassia gnus on Emacs 20.2(With mule).
 I fond 2 problems.

  One is when I display article (Mail/News)(SPC) that includes "'" in "From" line 
  like "Ken'ichi" , gnus never returns (C-g can stop) - maybe in infinite loop.
  Why it occurs??
  Does anyone knows ??

  The other is a gnus-agent problem.
  I always use gnus-agent on mule.
  Gnus-agent writes system-dependent file coding system when fetching article.
  Problem is the same one what gnus-5.4.x's pop3 has.
  So , I make a patch to fix this problem.
  Following is a patch.