hello sorry for the delay i did'nt try before because i was playing on a modded server and was able to put normal pics with a command :D... i just test on a regular server and it work perfectly when i run as administrator in 1.3 and now in 1.4 too.
I must create a link of the .exe (in install folder) to the desktop and run it as admin. Otherwise the regular "after install" icon on my desktop can't run as admin .. Problem solved for me ! Thanks