Removing fields in adult registration results in error

[mattcary]

I'm trying to remove all of the OPTIONAL fields (like homepage and ICQ handle) from the adult registration page, but when I do, after someone registers they get this error:

"All cookies cleared! Click here to return to the forums index"

when they should instead be automatically directed back to the forums index and logged in.

I'm even passing the optional fields I removed as hidden fields, for example:
<input type="hidden" name="homepage" value="http://">

...And still new registrars are directed to this error.

Any ideas?

Regards,

Matt