Unsure honestly at this point , is this a cryptopia thing or a SIGT thing.
Cryptopia - around since 2014 with hundreds of coins listed and loyal client base.
Signatum - around since July 2017 based on old copied code - made the wallet that crashed, made the website that crashed, made the block explorer that crashed, made the blockchain that looks like it has forked.
You decide.
Except so far it's only Cryptopias wallets that have had problems, the website just crashed recently when it didn't when Cryptopia was consolidating those thousands of addresses, and I'll wait on the verdict from the mining pools about whether or not a fork has occurred.