You might check to see if your mongrels are giving up as the process
is taking too long to process. It sounds like a time-out issue more
than an issue with attachment_fu. Check your mongrel and nginx logs
for details.
Robby
--
Robby Russell
Chief Evangelist, Partner
PLANET ARGON, LLC
design // development // hosting w/Ruby on Rails
http://www.planetargon.com/
http://www.robbyonrails.com/
aim: planetargon
+1 503 445 2457
+1 877 55 ARGON [toll free]
+1 815 642 4068 [fax]