Of course I have no idea about what can be the origin of this problem but let me add my two cents of information.
I dragged (with firefox 3) from my moodle profile
http://moodle.org/user/view.php?id=76222&course=5
the jpg of my children (I missed it on my local computer) and the downloaded file was corrupted.
By copying the path of the picture
, opening a new browser window and pasting the URL I got the correct jpg.(Try it by yourself to believe me!!!)
So the problem is not concerning icons, only!
Creating the same conditions and performing the same experiment with latest M19 using my local MAC computer as web server, I had no problem even by dragging the picture directly to the desktop.
Creating the same conditions and performing the same experiment with latest M19 using a far debian server, I had no problem even by dragging the picture directly to the desktop.
That is all.