Am seeing various timeouts coming from various sources. Please increase your timeout time from 30 seconds to 60 seconds. This should help resolve timeout issues. Aside from this am not seeing any other issue. Once the timeout issue has been addressed everything should work fine.
I recommend if possible upgrading to PHP 5.3 which features numerous memory leak fixes. You appear to be running PHP 5.2, which has many memory leaks that have been patched with 5.3 as seen below.
php.net/ChangeLog-5.php
Disabling CB Conditional will also resolve this issue, because it is a very heavy plugin; it performs checks on every field and tab to allow for the conditional display. This can be heavy at times depending on the host, install, and configuration.