Index: app/helpers/issues_helper.rb
===================================================================
--- app/helpers/issues_helper.rb	(revision 5223)
+++ app/helpers/issues_helper.rb	(working copy)
@@ -282,7 +282,7 @@
                   format_time(issue.updated_on)
                   ]
         custom_fields.each {|f| fields << show_value(issue.custom_value_for(f)) }
-        fields << issue.description
+        fields << (issue.description ? issue.description.gsub("\r\n", "\n") : nil)
         csv << fields.collect {|c| begin; ic.iconv(c.to_s); rescue; c.to_s; end }
       end
     end