Kevin Greiner writes:

  Kevin> Let's go with that assumption for now.  Try removing
  Kevin> gnus-agent-fetch-selected-article from the hook then see if you run
  Kevin> into any problems.  You can use either 'J s' to fetch by process
  Kevin> mark or 'J S' to fetch by downloadable mark.

I have removed gnus-agent-fetch-selected-article from
gnus-select-article-hook but the summary still highlights incorrectly the
downloaded ones with gnus-summary-normal-undownloaded-face in few of my
nnimap groups.  I tried removing the agent cache and gnus-agent-regenerate
but that didn't help. 

Attached screen shot.  here is my gnus-summary-line-format.

(setq gnus-summary-line-format "%U%R%z%5N%O %(%8&user-date; %~(pad 2)~(max
2)~(ignore \"1\")t%[%5k:%* %-20,20n%] %B%s%)\n")

where should i start debugging this problem?
-- 
Danny Siu