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There was a problem with the module CGBlog. I can not upload an image using a custom field (type of image). By pressing the "send" in the administrative interface drops white screen. When the page refreshes required to re-enter login and password to cms. Record is published, but the image is not loaded.
folder on the path / uploads / cgblog / id ... an empty.
P.S. CGBlog rolled back to version 1.12.10, the problem persists

CMS 1.12.1
CGBlog 1.13.1

White screen >> Error 500 >> check Error Log

Rolf, thank you for the tip! The error log helped me! The problem was related to the watermark!