I think that this can now be closed as resolved.

This has now been fixed by the author of this tool, see https://commons.wikimedia.org/w/index.php?title=User_talk:Dschwen&oldid=551241765#Zoomviewer

I am one of the two users who has currently a problem with OTRS ticket notifications.

I've now (some hours laster) reattempted the deletion and it worked now. Any idea or insight what happened?

file looks at the beginning of a file. Example:

I just run into this problem when I today tried to upload this JPEG file. Despite being a correct JPEG file it appears to be considered as a corrupted part of a multi-volume ZIP archive by the unzip utility of info-zip.org:

This is complex as the Commons category system is far deeper than any other category system. Take as example Category:Cathédrale Notre-Dame de Chartres (which is not even linked to Q180274 as preference was given to the gallery page which is of no real importance to Commons. This category comes with subcategories like Category:Exterior of Cathédrale Notre-Dame de Chartres, Category:Portals of Notre-Dame de Chartres, Category:Royal portal of Cathédrale Notre-Dame de Chartres, and finally even Category:Right bay of Royal portal of Cathédrale Notre-Dame de Chartres, all properly nested in this order. It seems unpractical to link all these categories to Wikidata items. If you look at these cases, you see a stem, i.e. "Cathédrale Notre-Dame de Chartres" (which is in French as it is considered a proper noun) and various general specializations like "exterior of", "portals of" etc. We need an approach to tackle these composite category names by defining naming schemes which should be translated instead of translating each category individually.

And the addition of the latest "thanks you" enables a new kind of vandalism. Check the log of new users and you will notice that offending user names are not uncommon. In combination this opens the possibility to thank a victim using an offending user name such that the user name appears in the victim's profile.

One of the major problems of this feature is that pictures are taken out of context and associated with this "profile". Imagine a moslem editing https://de.wikipedia.org/wiki/Mohammed who is possibly not happy to see his name and profile associated with a depiction of Muhammad. Likewise you might imagine that someone edits an article with lead images that depict genitals. You see examples for this on Lila's talk page at Meta.

A bounce was delivered in case of ticket 2015020910006133 with following error message: