I turned on WP-Cache plugin for my wordpress blog and lo and behold I end up with a blank page until I hit Refresh. Seems like it’s a bug in WP-Cache code which was written in PHP4 and I’m running PHP5.

Here’s the fix:

Edit wp-content/plugins/wp-cache/wp-cache-phase2.php.
Replace ob_end_clean() with ob_end_flush().