Bittrex staff has informed me they have successfully upgraded to EverGreenCoin version 1.5.0.1.
C-Cex as well.
EDIT: C-Cex is still in maintenance. They must be performing a reconciliation still.
Bittrex is confirmed. Happy trading!
Great, is it just yobit to go now? Their wallet is reported to be offline - block height there is 892449 - dont have access to my wallet so can't see if they are on the new chain or still on the old one...