Hi Veronika,
Thanks for attaching the log file, and for confirming that you have the same Panorama permissions as your colleague. I had a look at your log, and the folder where you are unable to upload files via AutoQC Loader.
We upgraded the PanoramaWeb server on November 14th, and I believe the problem you are seeing is because some the permission on the Linux filesystem are incorrect after the upgrade. The last document successfully uploaded by your colleague to the "Exploris 480 - SS-FAIMS" folder was on November 13th, before the upgrade. I have fixed the permissions in the folder. Could you please give it another try? Let me know if it still does not work.
I will request our IT group to review the Linux filesystem permissions on the server on Monday. In the mean time, please let me know if there are any other Panorama QC folder where you are having the same problem.
Thank a lot for reporting this issue.
-Vagisha