Can't play Minecraft: Windows 10 Edition BETA

Hello. Since 29th of July, 2015, I have two annoying errors.
First: worldError.IO. This doesn't lets me enjoy the game and create the world.
Second: Saying "That's not Minecraft skin, silly" on a MINECRAFT SKIN. Seriously... _ It thinks that .png file of a Minecraft skin is NOT Minecraft skin.

When those errors will be fixed?
-Nick Philips