After creating a channel entry, altering the category I got an autosaved entry. So far so good.
Clicking on “autosaved entries”, I got to my entry. Very good! But now I had an attachment (image) which I did not upload. It was a “text only” entry without any images or files!
The attachment is named “.” ? Seems to me like an EE bug.
EE was throwing this:
A PHP Error was encountered
Severity: Notice
Message: Undefined index: filename
Filename: libraries/File_field.php
Line Number: 77
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /homepages/...somedir…/htdocs/ckient_xyz/system/codeigniter/system/core/Exceptions.php:170)
Filename: core/Common.php
Line Number: 408