I am having the same problem, has there been a fix for this? I am certain my picture is the correct size (120 x 120 or 64kb). Below is the coding I am getting.
Call to undefined method vB_DataManager::vB_DataManager() on line 136 in /var/www/html/www.quiltingboard.com/releases/QB.2018.06-R1/vbulletin/includes/class_dm_userpic.php
#0 /var/www/html/www.quiltingboard.com/releases/QB.2018.06-R1/vbulletin/includes/class_dm_userpic.php(89): vB_DataManager_Userpic->vB_DataManager_Userpic(Object(vB_Registry), 1)
#1 /var/www/html/www.quiltingboard.com/releases/QB.2018.06-R1/vbulletin/includes/functions.php(504): vB_DataManager_Userpic::fetch_library(Object(vB_Re gistry), 1, 'userpic_avatar')
#2 /var/www/html/www.quiltingboard.com/releases/QB.2018.06-R1/vbulletin/profile.php(3255): datamanager_init('userpic_avatar', Object(vB_Registry), 1, 'userpic')
#3 /var/www/html/www.quiltingboard.com/releases/QB.2018.06-R1/vbulletin/vbseo.php(1400): require('/var/www/html/w...')
#4 {main}
Please advise.