can not upload a new version of an image
The cached file is likely being delivered by Incapsula. If memory serves you can get the latest version of the image by refreshing using Ctrl + F5.
Ctrl + F5 did not do it for me.
So userbase/kde etc are Incapsula customers ?
Interesting, it should have. Guess Mediawiki must be caching as well. Yes, we are users of Incapsula.
I guess the the cache will eventually time out and I will see the new version of the file tomorrow or something.