As an admin, I'm logged into my site and the title block keeps disappearing. If I clear the cache it comes back, but if I refresh the page it disappears again. 

Any ideas?

Accepted answer

Turns out there is a bug that causes mysterious problems if you remove the Main Content Block from a template. There is a warning on the block to this effect, but somehow I didn't notice (or was distracted). 

The problem for me was masked by the fact that it did not appear while I had the setting to "Rebuild the theme registry on every page load" checked (devel module). However, as soon as I turned this off, the problem showed up. 

For more information or to help solve this problem:
https://github.com/backdrop/backdrop-issues/issues/3387
https://github.com/backdrop/backdrop-issues/issues/3247

Comments

Turns out there is a bug that causes mysterious problems if you remove the Main Content Block from a template. There is a warning on the block to this effect, but somehow I didn't notice (or was distracted). 

The problem for me was masked by the fact that it did not appear while I had the setting to "Rebuild the theme registry on every page load" checked (devel module). However, as soon as I turned this off, the problem showed up. 

For more information or to help solve this problem:
https://github.com/backdrop/backdrop-issues/issues/3387
https://github.com/backdrop/backdrop-issues/issues/3247