Invalid token while trying to save user

[tiaracompany@.....com]

Hi,

I am getting Invalid token while trying to save user or something error on my site http://www.windsorbridaljewellery.com.au/. Frontend login credentials are below. Please try to checkout on multiple products. Please advise ASAP.

username: boss
password: test1

[admin]

Hello, the token is generated on each ajax call - pls see if your shipping rates are properly generated with no javascript errors in the console.

If the site with the token is all white with just a single line of the text, then this is the joomla token. If there is anything else shown on the site, it may be your captcha plugin - you may try to enable captcha at OPC to see if it shows up and works. I can help you fix this directly on your site, pls write us an email to info@rupostel.com

Your site is very slow and i can't even get the add to cart to work, pls advise.

Best Regards,
Stan

[admin]

Hello, i've located the issue:
- pls enable ajax at the OPC configuration page. This option is only for a very limited usage.

Do not use AJAX
MUST NOT BE CHECKED at the shipping tab.

best regards,
Stan