Site has lost validation, cannot restore

[LBS]

I recently copied my site running X theme to a staging server to test some changes. When I copied the updated site back from staging to live, it lost the theme validation. I have tried entering my license in the validation screen and hitting return, but I just get a white screen - the validation does not go through, and no error message displays.

[ruenel]

Hello @LBS,

Thanks for writing in! A white screen could mean a fatal error. You may have exhausted the PHP memory limit which is the usual cause of this fatal error. ​We recommend that you increase your memory allocated to PHP. To increase it, please edit your wp-config.php file and insert these lines:

define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );

You can add it before the line
/*That's all, stop editing! Happy Blogging. */

We would loved to know if this has work for you. Thank you.