files not moved from temp to destination

[davidenke]

Using version 3.10 stable build 10 with Contao 2.11.6, the contao-check is allright (no .phar extension, no SMH needed), PHP version 5.2.17, tmpfile() exists - everything else working.
Filetypes, uploadsize and -quantity are set globaly and in the ffl (tried different variants).

The upload in the Frontend is working properly, the json-Response are okay.
But the files are not moved from the temp folder to the destination (my destination folder is btw. not tl_files, I changed that in the tl_settings).

I tried with/without destination folder and with/without the user folder in all variants - without success.
(s. description here https://community.contao.org/de/showthread.php?16867-valumsFileUploader-Mehrfachupload-ohne-Flash&p=235256&viewfull=1#post235256)