my friend i have the same problem this is happening because of a plugin.if you disable the plugin and turn off hooks at vb options then it goes away but then you dont have the plugin.i was told to repload all the vb files but i done that and it still happens when i try and put any plugin in...and no body is helping me this is a vb problem if the vbulletin website cant help us then what are we supposed to do....some one help
https://vborg.vbsupport.ru/showthread.php?t=114913