What is the problem with Bittrex with ZenCash wallet. It's under maintenance for the second day. I can not send my ZEN

The ZenCash network was the target of a 51% attack on 2 June at approximately 10:43 pm EDT.
The ZenCash team immediately executed mitigation procedures to significantly increase the difficulty of future attacks on the network. We are conducting forensics and will forward our findings to the appropriate authorities.
https://blog.zencash.com/zencash-statement-on-double-spend-attack/ It was taken down as a precaution and will be up again soon.