Cannot add a site to multisite installation with fresh install of WP 4.2.2

I downgraded my site to 4.1.5 and was able to get it to work smoothly. Any resolution? I see others are having similar issue. Thanks!
This is the error I would receive:

Warning: preg_match() expects parameter 2 to be string, object given in /home1/xxx/public_html/wp-includes/formatting.php on line 3435

Warning: preg_match() expects parameter 2 to be string, object given in /home1/xxx/public_html/wp-includes/formatting.php on line 3424

Warning: preg_match() expects parameter 2 to be string, object given in /home1/xxx/public_html/wp-includes/formatting.php on line 3435

Warning: strip_tags() expects parameter 1 to be string, object given in /home1/xxx/public_html/wp-includes/formatting.php on line 3407

Warning: strip_tags() expects parameter 1 to be string, object given in /home1/xxx/public_html/wp-includes/formatting.php on line 3407

Catchable fatal error: Object of class WP_Error could not be converted to string in /home1/xxx/public_html/wp-includes/kses.php on line 1038