TYPO3 Core

Sometime the image thumbnails in the page module are not shown in the TYPO3 backend.
The reason for that could be missing reference count values in tt_content.image.

A work-around is to update those counters in SQL (don't use if workspaces are enabled and used):

UPDATE tt_content
SET image=(SELECT COUNT(*) FROM sys_file_reference
WHERE uid_foreign = tt_content.uid) WHERE uid IN (SELECT uid_foreign FROM sys_file_reference);