Minecraft for Windows 10 does not appear to load, gets stuck around half way, similar to the previous issue with iOS Edition. The issue does not affect iOS Edition. No error messages are displayed and the 'wave' load animation does work. Could it be linked with Microsoft accounts? (Mentally prays someone from Mojang sees this and tries to fix it).

Checked on @MojangStatus and no mention. (16:12 30/01/2020)