Hi,
if you had read the case, you had found the information that I'm creating the site at the moment. I do not have any testserver to upload.
To be honest since many days I got nothing. In the meantime I searched by myself. The problem is related to a local installation (which is here the case) and in case there is a sub folder in the image folder, the media manager is not working. This issue came with version 4.00 and we are now on 4.05. You are not able to find this old issue, and you are not able to solve this problem since three release steps!
This makes me very angry, no help asking same question twice!
I hope you aware now on this issue and we can expect a fix with the next release.
You should be easilie able to reproduce it localy using XAMPP at your machine.