It isn't a plugin problem.
Subscribe.ru code was placed in the text widget in the right sidebar. After the text widget was removed, the ad remains. Server company says that the code inserted itself somewhere else in the site and I need to identify it.
Can I ask where you came up with jx_ui_widget?
I remember from before there is a place I can go on the site admin where I can see all of the cached values for settings and plugins, can't remember how to get there. Wondering if that code is cached somewhere on the site?