cannot add a widget in widget controller

Question

Did anyone had this experience? Drag the "widget controller" and then click on the plus icon you get a black block.

LefterisKoumis · Answer

Chrome. Not selecting the block in the frame. Refreshed several times. Thanks.

ABishop · Answer

What browser are you using?  Also, when you drag the widget controller... you may be selecting the block in the frame?  Try refreshing the page and see if it goes away.