Registration will no longer work shows session time out

Have reviewed your install and your issue is due to 3rd party extension "System - EasyCalcCheck PLUS - ECC+". I've disabled it, cleared cache, and was able to register twice in a row perfectly fine. The plugin appears to add Captcha, but if you need captcha you should be using CB AntiSpam which provides captcha as a CB field.

Thank you for your review. This resolve seems to work only temporarily. Than issue comes back. I asked for help from a co-worker and he sent me this, but doesn't know how to help to resolve. Please help?
I've found so far that CB code issue an error.
Latest trace in file components/com_comprofiler/plugin/user/plug_cbcore/cb.core.php
function fieldClass( &$field, &$user, &$postdata, $reason )
....
parent::fieldClass( $field, $user, $postdata, $reason ); // performs spoofcheck.

The spoof check is supposed to be performed. Your issue is probably due to the page caching if it comes back over time. The registration is being cached, including its spoof input which is supposed to change on every view. Disable and purge caching and it should work fine from then on. Currently you only have view caching disabled, but not page caching. Page caching is disabled by disabling Extensions > Plug-in Manager > System - Cache.