TYPO3 Core

This is usually bound to PHP's OpCache and existing PHP processes still checking for the old code. Is that possible?

Hi Riccardo,

Sorry for the late answer, I just came on my own post while having the same problem again.

In the meantime, I run TYPO3 7.6.32 (while updating to 8.7.27) on PHP 7.2.22.

Attached a few screenshots for a better understanding what happens.

1 The first one shows only the system parameters.
2 The second one shows the available items in the left navigation column.
3 On the third one, I install the Recycler, but it is the same failure and procedure with every other extension.
4 After reloading the backend, or after a few clicks, the red connection problem layer appears.
5 After a second reload, or after a few more clicks, the TYPO3 Fatal Error appears, telling that the extension is not loaded.
6 After clearing all caches and the PHP opcode cache in the install tool, the backend is accessible again, but the extension, in this example the Recycler, has gone.

This happens to all extensions except the ones visible on the last screenshot (because they are system extensions?).

The same problem appears also in TYPO3 8.7.27 on PHP 7.2.22.

If helpful, I can supply additional informations, just tell me which ones and how to get them.

Best regards, Ivo

No feedback for some months and most likely a problem with the hosting configuration. I'm going to close the issue now - if it pops up again, feel free to comment.