I really like this plugin and it does exactly what I need.
However when I altered the default image upload path and corresponding full URL (Settings > Media Settings) I get a Server 500 error when requesting a resized image on the fly.
Note - in the Media Settings screen the new upload path I've chosen is outside the wordpress install directory (/home/some/folders/images), and the corresponding URL has been entered as a subdomain (http://images.siteaddress.com)
The error_log indicates there is a redirect loop issue:
"Request exceeded the limit of 10 internal redirects due to probable configuration error."
Has anyone come across this issue?