graeme_p - 5:07 am on Aug 22, 2011 (gmt 0)
Did you untick "allow third party ...."? That should work, but you may also need to go to website storage settings and "delete all sites".
The /dev/null trick above is for Linux (should work on MacOS. although I cannot test that), but recent versions of Windows have symbolic links and a nul file (called NUL) so you might be able to adapt it.