I too have a bit of a similar problem than
Sidebars are not shown in Appearance / Widgetsthat occurred today after updating Betheme.
I have used Betheme as the basis but then used the built-in-theme sidebar options to create a side menu for the pages. On the left i also had different sidebars for each page. I started to be happy with what i have done, but today after the them update all sidebars AND THE CONTENT are lost!

This is frustrating since I have in css done a lot of changes. The css of course isn't lost, but if all content is, then i have to find the right "aside#text-10" places in the code, which is extra work. Also if the html etc. inserted in the sidebars is lost, that's not good
And it's also a big deal in the sense that can i trust the theme to work in the future????
On other sites I've built I've been happy with Betheme so really hoping this is a solvable and not a recurrent problem!
br,
Henna
Comments
The fix will appear today, so please stay tuned.
Thanks
Thanks
This was only one time accident.
Best regards