Can Not Register

ok, so I have been away all weekend and I have not made any changes to my website but a few people have tried registering and they get the login page time and again when they click on "Register"
To re-create this go to www.vetsinpain.org and click on the main menu item "community"

Please disable your SEF extension and confirm if working. Users are only seeing login because you've a login module at bottom of page, but the component container is empty only stating "Joomla SEF URLs by Artio" and nothing more. Please also check that you've Tabs with fields on them that are public and published. Tab permissions determine field permissions and can prevent fields from displaying on registration.

I did everything you said and can not get the registration page to show up. I tested different permissions on the Tabs, turned off SEF. I am still getting the container showing "SEF by Artio" (which should not be showing since it is a paid version)
What else can I try? This was working perfectly before the weekend.

This was working perfectly before the weekend.

Please try and recall what was changed during the weekend. CB does not simply time bomb and stop working. SOMETHING was changed to result in this. I recommend enabling debug mode and maximum error reporting within Joomla global configuration to see if any fatal errors are present. If not leave on and disable CB plugins 1 by 1 until resolve. If not then repeat with Joomla system plugins. Typically something like this is due to a conflict of some sort. As reviewing source the entire component it self isn't loading; if it was a matter of tab/field permissions as least SOME elements would render, but none are.

HELP! I leave for vacation tomorrow and I need to have this registration problem figured out...Can you quick help me please Kyle?

This is what I get and I do not understand any of it:
500 - JDatabaseMySQL::query: 1146 - Table 'vetsinpa_jo161.jos_plugins' doesn't exist SQL=SELECT id FROM jos_plugins WHERE element = 'joomsef' AND folder = 'system' AND published = 1

Call stack
# Function Location
1 JSite->route() /home/vetsinpa/public_html/index.php:37
2 JApplication->route() /home/vetsinpa/public_html/includes/application.php:136
3 JRouterSite->parse() /home/vetsinpa/public_html/libraries/joomla/application/application.php:213
4 JRouter->parse() /home/vetsinpa/public_html/includes/router.php:77
5 JRouterSite->_processParseRules() /home/vetsinpa/public_html/libraries/joomla/application/router.php:110
6 JRouter->_processParseRules() /home/vetsinpa/public_html/includes/router.php:369
7 JRouterJoomsef->parse() /home/vetsinpa/public_html/libraries/joomla/application/router.php:282
8 JoomSEF->parse() /home/vetsinpa/public_html/components/com_sef/sef.router.php:199
9 JoomSEF->_parseSefUrl() /home/vetsinpa/public_html/components/com_sef/joomsef.php:587
10 JDatabaseMySQL->loadResult() /home/vetsinpa/public_html/components/com_sef/joomsef.php:899
11 JDatabaseMySQL->query() /home/vetsinpa/public_html/libraries/joomla/database/database/mysql.php:327
12 JError::raiseError() /home/vetsinpa/public_html/libraries/joomla/database/database/mysql.php:208
13 JError::raise() /home/vetsinpa/public_html/libraries/joomla/error/error.php:179