I can confirm this is still happening and has been for sometime. I created a support ticket with LL.
This is not only just affecting their viewer but thrid-party viewers, I can also confirm it's not only avatar textures but world textures and loading also (http://prntscr.com/52jexy).
I have been through various troublshooting steps on my part and it's very clear and fair to say this is down to LL. When clearing cache, uninstalling, multiple viewers, restarts and graphics driver updates does nothing to the issue present and other things are working fine from the HDD and network connection you're using there is only one reason and it will be down to an error somewhere pointing from LL, if that be their servers or networking.
Hopefully, LL will see this issue and address it fairly promply as well, what the point of a virtual world that's not really that virtual anymore... haha.