I front my SlimServer with Apache and mod_proxy on an internet facing linux box
with the following config:

<VirtualHost _default_>
    ServerName slimserver.myserverbox.com
    ServerAlias slimserver
    ProxyPass / http://myslimserverbox:9000/
    ProxyPassReverse / http://myslimserverbox:9000/
</VirtualHost>

When viewing artwork through the Apache/mod_proxy URL (using both the Default,
Handheld, and Fishbone skins, the cover artwork images don't show up.  The
images show up fine when connecting to the "myslimserverbox:9000" address
directly.  Note that the rest of the slimserver functionality appears to work
just fine.  There was one thread on the mailing list regarding this bug.  The
poster tracked it down to the fact that the image URLs contain "%2F" which is a
special character sequence in mod_proxy
(http://httpd.apache.org/docs/mod/mod_proxy.html#percent2fhack) and is treated
differently.  If I replace the "%2F"s in the URL with "/" the images show up. 
Is there any way to not use the %2F characters in the image URLs?