Hello komir

Please share your administrator access here to check the issue. Use the Hidden Content box to share the credentials.

Best regards

Thank you. You have credentials in hidden Content.

Please try uninstalling SP Page Builder and then install it again. Make sure you have taken a backup before doing this.

Hi If I uninstall it I will lose all pages?

Generally, you will not. But it is better to keep a backup.

I have uninstall and install back, but, nothing is changed

I'm having the same problem. Even when editing and saving an existing module, all content disappears...

Try update Helix Ultimate Framework to version 2.0.5 or change PHP 8 to 7.

Thanky ou Using 2.0.5 https://nimb.ws/jFIdAr and PHP Version 7.3.30 but problem is not solved

I have cleaned up joomla cache and browser cache and now it seems to be ok.

Thanks for the update.

Here is still not working. I try with few web browsers

Please take a full site backup with Akeeba Backup in ZIP format and share here. Follow this tutorial