Mainly an FYI to Crafty.
I warped out to LifeLongStew7 who was about 2k out in the nether but I was unable to interact with any blocks and my name was still in grey. I logged out, deleted my assets, logged in - nothing seemed to fix it. Then after about 6 ot 7 min it corrected itself. I cannot correlate the correction to any event but my name went back to Cyan and I could break blocks etc.
I have warped before with no issue (from Nether spawn in this occasion).