I am currently using the latest version of Minecraft on their old launcher. My issue is that nobody's skin loads on Multiplayer servers. They ALL take on the look of Alex. No personal skins will load.
I have reset my skin, re-installed my game (including deleting all .minecraft folders), and anything else I could find online, to no avail.
If I use the new launcher, I get the infamous "Stuck on loading terrain" error. This thread can be found here.