I started receiving errors today when installing any plugin

Hi, I started receiving errors today when installing any plugin inside the wpmu dashboard. Then realizing the only thing I did differently today was install Visual Composer. After deactivating it, things were back to normal. Does anyone know if VC is compatible with WPMU plugins. Or if there is a setting I need to set inside VC to make WPMU plugin installs work. I really do hope so, that plugin is vital to any wordpress install. Thanks Guys,