I get the same thing. If I simply re-fresh the page it actually creates the account and the next time it logs in fine... here is my debug from the error:

OW Debug - Notice 

Message: Undefined variable: spam_check 

File: /var/www/ow_plugins/antispammer/init.php 

Line: 72 OW 

Debug - Notice 

Message: Undefined variable: acc_role 

File: /var/www/ow_plugins/antispammer/init.php 

Line: 127 OW 

Debug - Notice 

Message: Undefined variable: acc_id 

File: /var/www/ow_plugins/antispammer/init.php 

Line: 133 OW 

Debug - Warning 

Message: Cannot modify header information - headers already sent by (output started at /var/www/ow_utilities/debug.php:203) 

File: /var/www/ow_utilities/url.php 

Line: 84 OW 

Debug - Warning 

Message: Cannot modify header information - headers already sent by (output started at /var/www/ow_utilities/debug.php:203) 

File: /var/www/ow_utilities/url.php 

Line: 85

hrmmm... removing the "Admin Toolbox" plugin fixes the issue for me...

fbkca you are right on point. Installing the 'Admin Toolbox' sent my live site blank, I had to delete the plugin directly from the cpanel (Which was not the best thing to do). Ever since the Facebook plugin started malfunctioning (It wasn't the update).

I guess I have to look into the database tables.

Thanks for your info.

Topic was moved from General Questions.

Obasi, let me know the results.

I think your and fbkca's issues are different ( judging by the debug errors you have PMed me).

Hello , I have this same issue , please help me , after login with facebook , it will go to /500.phyml .

it said Error 500

INternal server error , 

I don't have any "admin tool" plugins , could someone please help ? 

Enable debug mode to see the actual error and copy it here, so we could assist you better.