Jan-Philip,

my experience there is that browser caching is acting differently depending 
wether it's a "top-level" resource or an included resource. Images are 
typically never top-level resources (they are embedded in html pages) but you 
can open them in a separate tab using a contextual menu command. Reloading then 
can only mean actually fetching the image from the server.
This changes the cache entry; following html pages can then use the properly 
refreshed cache entry.

The same applies when you change included js or css files although browsers 
have a tendency to look somewhat randomly at refreshing their cache, leveraging 
the if-modified-since header quite a lot. There seems to be some black-art 
hidden there which is likely related to some statistical profiles of each 
server (e.g. a server which changes frequently would be more refetched)...

Paul


On 26 janv. 2013, at 23:40, Jan-Philip Loos wrote:

> Hi there,
> 
> I just updated XWiki from 4.4 to 4.4.1 and it's now perfect.
> 
> For others run in this problem: If you updated double check the browser
> caching, it wasn't done with shift + f5 in chrome.
> 
> Thanks a lot for the answer

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