Thanks for your answer. And for support!
You can question Cryptopia where is the 'network fork' when you write to them.
I cannot find chain split, for me the network is going nice with min 7 nodes at the moment.

The checkpoints are only for additional security.
And for .. cryptopia - when(if) they upgrade thei wallet form GitHub there will be no reason to disable the market.
On cryptopia market
Someone bought 5.7 mln XDC for 1 satoshi (around 150$)
19/05/2017 6:38:34 PM Buy 0.00000001 5748075.67327357 0.05748076
I will provide windows wallet as soon as possible.