Thread:Project:Support desk/URLs are rewritten, but not redirecting

I'm having difficulty with the directions here to rewrite URLs. In LocalSettings I set:

$wgScriptPath = "/w";

$wgArticlePath = "/wiki/$1";

And this is my .htaccess file in the web root:

RewriteEngine On

RewriteBase /

RewriteRule ^/?wiki/(.*)$ /w/index.php?title=$1 [PT,L,QSA]

RewriteRule ^/?wiki/*$ /w/index.php [L,QSA]

RewriteRule ^/*$ /w/index.php [L,QSA]

(My host, Laughing Squid, suggested I add the RewriteBase line.)

The rewritten URLs are accessible (http://ilaisu.org/wiki/Test), which suggests I did SOMETHING right, but when I do anything like edit a page or use the logo to go back to the main page, it keeps going back to the long form of the URL (http://ilaisu.org/w/index.php/Test). All the links such as preferences, contributions, etc. also use the long forms. What am I doing wrong?

-Joey