It seems so. The host's support team fixed the issue. They said it was due to mod_security configuration

Domas

On Fri, Feb 29, 2008 at 2:27 PM, Earnie Boyd <earnie@users.sourceforge.net> wrote:
Quoting Domas <tasdomas@gmail.com>:

>
>> Yes, but phpinfo() says it's PHP 4.4 or something (can't check right
>> now)
> I've tried it with both PHP 4.4.7 and 5.2.5 (both supported by the
> host). The problem appeared in both cases.
>

What do the mod_security logs say?  Perhaps it is preventing php from
writing to mysql in some cases.