Not sure if I is happening to me is what Charlie is describing but with WP 2.6.1 + WP Supercache 7, when I use the HTACCESS above, it makes my site unreachable (page load failures). I tried deleting the cache, disable the plugin, renabling, etc.

I think the fact that I have Eaccelerator may be causing a problem.

Temporarily, I have restored the original HTACESS and running on WP-Cache only (HALF ON option).

Is anyone else in my boat?