I've upgraded from latest D5 to D6.13. Now after I've upgraded all the content is no longer shown. I've installed Devel to understand it, but the only think I found out yet - is that "Devel load" have text in body as it is and "Devel render" changes the body to "" (nothing). The content is still in the DB and is shown on the node edit page, but not in view.

I have tried to clear the caches, save all input format pages again without any changes, but no change at all. :-(

Comments

I have just had the same

I have just had the same problem. I installed the Mollom module, and now no content is displayed. There are no errors, the rest of the page renders just fine. The content is visible in the Edit view. View source reveals that is occurring, there's just nothing inside of it.

So I guess my issue differs in that I didn't upgrade core from 5 to 6, but rather installed a module. I've disabled the module with no success in fixing the issue.

Backup and remove that module

Do you have a database backup and Drupal directory backup just prior to the installation of that module?

Backup your database and all the files in Drupal installation directory. (Important)

Disable that module.
Uninstall that module.
Remove that module from sites/all/modules.

Restore the database from backup made prior to installation of that module.

Run update.php.

Check site for errors.

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