Can't put a widget into custom Sidebar
I've created a Sidebar through Betheme-Theme Options-Sidebars. Saved the changes. In Appearance-Widgets I can see my sidebar. I populated it with a TEXT widget, added the name and all the stuff, pressed Save and Done buttons. Everything seemed Ok just like in https://support.muffingroup.com/video-tutorials/how-to-create-sidebars-and-manage-them/ video. But when I visited Posts area I then went back to Widgets I've found empty Sidebar. Any widget I tried to place in the Sidebar disappeared the same way.
What have I done wrong?
Update. I've written the names of my custom sidebars in Latin lettes. Now the widgets stay in even if I exit "Widgets" page and enter it again. But I still can see no widgets on site pages. Plugins deactivations did not help. Yes, I have chosen Sidebar for every site page.
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