We’re having the same problem after upgrading, and we’re running Pro 1.2.3, now when we enter the forums we get this:
Fatal error: Uncaught Error: Call to undefined function x_get_breadcrumb_delimiter() in /srv/users/serverpilot/apps/intfan/public/wp-content/themes/pro/framework/functions/global/plugins/bbpress.php:439 Stack trace: #0 /srv/users/serverpilot/apps/intfan/public/wp-includes/class-wp-hook.php(298): x_bbpress_filter_breadcrumbs(Array) #1 /srv/users/serverpilot/apps/intfan/public/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array) #2 /srv/users/serverpilot/apps/intfan/public/wp-content/plugins/bbpress/includes/common/functions.php(1420): apply_filters(‘bbp_before_get_…’, Array) #3 /srv/users/serverpilot/apps/intfan/public/wp-content/plugins/bbpress/includes/common/template.php(2257): bbp_parse_args(Array, Array, ‘get_breadcrumb’) #4 /srv/users/serverpilot/apps/intfan/public/wp-content/themes/pro/framework/functions/global/breadcrumbs.php(280): bbp_get_breadcrumb() #5 /srv/users/serverpilot/apps/intfan/public/wp-content/themes/pro/framework/functions/global/breadcrumbs.php(43): x_breadcrumbs_data(Array) #6 /srv/ in /srv/users/serverpilot/apps/intfan/public/wp-content/themes/pro/framework/functions/global/plugins/bbpress.php on line 439