I have RSS Owl working through my proxy - I am able to download all of my feeds, but I am unable to use the internal proxy - CTL- b will toggle between html code and nicely formatted text, but if there are any embedded images, they do not appear. I just get a message that the address cannot be resolved.
My mozilla is configured for proxy use, and works perfectly.
Afaik this is a known bug with SWT. Proxy Settings are not recognized from within RSSOwl for the Browser. Which version of Mozilla do you run?
Mozilla 1.7.12, Copyright (c) 2003-2004 mozilla.org <developer build>