I have the following Short-hand for a user profile url
RewriteRule ^(\\w+)/?$ ./profile.php?name_of_user=$1
The site is styled with the app
I've had what seems to be the same problem. I was trying to redirect from a site of the form: www.foo/category/details.
I found the slash after "category" stopped both the CSS and images from being loaded.
The cause is the default redirection passes the original URL to the browser. This can be seen from a JScript trace on window.location.pathname. The solution is simply to use a [R] flag in the rewrite rule.