i have a strange problem. Whenever i activate the W3TC i randomly get 500 internal server errors even though all caches have been disabled.
I get these errors only on a parent site of the Multisite installation. There are no problems on any child sites.
I also tried removing everything from .htaccess that W3TC has added but the problem persists. The problem is gone after deactivating the plugin from the plugin manager.
I use the latest version of WP (3.5.1) and latest version of W3TC (0.9.2.6). I also use Cloudflare together with mod_cloudflare and its plugin installed.
The strange thing is i had similar problems with the WP Super Cache.