[eluser]johncook[/eluser]
Nothing as simple as typos (I wish it were that although I would be bludgeoning myself with a blunt instrument right now if it were that simple).
I know it's not a typo because if I simply remove the %1/ from the rewrite rule, it works. Eg - these rules work:
RewriteRule ^images/(.*)$ images/$1 [L]
RewriteRule ^images/(.*)$ %1/$1 [L]
These rules give a Internal Server Error:
RewriteRule ^images/(.*)$ /images/$1 [L]
RewriteRule ^images/(.*)$ images/%1/$1 [L]
RewriteRule ^images/(.*)$ images/cavaliers/$1 [L]
I just checked the permissions and both images/ and images/cavaliers/ have chmod 2777 (eg - read & write permissions are all good to go). I really appreciate all your advice - I'm on the verge of giving up on this though, it just doesn't make any sense.