Unable to view text block

This site was built by a consultant back in 2016 and handed off to us to manage.

Are you familiar with using a ftp client? Please go to your ftp folder of enfold-child and have a look if there are other files than :
style.css , functions.php and screenshot.png – if so – please tell us what folders/files are in additon on the server.
Maybe that consultant has created some own child-theme files.
Updating via the dashboard does not overwrite these files ( and that is among other things the advantage of a child theme ) – but sometimes when essential files are updated the child-theme files had to be adjusted.
F.e. some users got an own child-theme header.php – there was a time where the lightbox implementation changes on Enfold Parent Theme ( and that is in header.php) – so after updating the lightbox does not work anymore.
it would help if we knew if such extra child files existed.

Next assumption: Updating via the dashboard does not always work correctly. It seems to finish the update process successfully, but it has left write errors.
i do always update via ftp this way: https://kriesi.at/support/topic/some-hints-and-advice-to-update-enfold/#post-1056107
This also has the advantage that there is always a rollback in case of inconsistencies.

If you have your child-theme – than you can try that if it brings back a working textblock alb. ( except there are the given : Maybe on top )

Yes – Thats why i post the link: https://kriesi.at/support/topic/some-hints-and-advice-to-update-enfold/#post-1056107

See documentation how it’s generally done. Easy – drag&drop. : https://kriesi.at/documentation/enfold/install-enfold-theme/#ftp-install

if you are on the layer where enfold and enfold-child folder are siblings ( on your client see image press: “Up one level” )
you can do it like in my link said:

Update via ftp.

• Rename the downloaded newest version to enfold-new
• Upload that enfold-new folder to the themes folder
• Rename your enfold folder to f.e. enfold-old
• Rename your enfold-new folder to enfold
• Check if all your existing settings work to your full satisfaction.

Yes – then stop here

No ( rollback ) –

• rename back the enfold folder back to enfold-new
• rename the enfold-old folder back to enfold

It would help if you were willing to follow the instructions. It’s uncertain if it will solve the problem, but at least it will help you to avoid writing mistakes or orphaned older files.

Through this procedure, I think I’ve explained it well, you have exactly this safety in the backhand – to return to the previous state.
The trick on this is not to overwrite the existing enfold folder but to upload a new one with a different name ( enfold-new). When this is done only a double renaming on the ftp folder does change the enfold parent themes. The existing is renamed to enfold-old and the newly uploaded now is renamed to enfold. From this moment the newest is the source for the enfold-child ( because that is the reference : then name of the folder: enfold ).

After all, I gave you the links to help you get ahead here.
My kind of help is always the help for self-help – under the aspect of the steep learning curve. If you always want to be dependent on help from others, you can do so.
Dito: Have a great rest of your week and take care!