Okay this is really ugly right now. I downloaded the snapshoot image (thanks tekna) and setup a second machine with the old wallet file. Now i have two computers:

1) Block High 716871, 18 connections, 35 million coins (in fakt not working)

2) Block High 728914, 6 connections, 32 million coins (01.nov 2017)

Both are staking and in sync. I guess machine #2 is connected to the network assumed to be the actual one.

What a crap coin ! We have 2 networks now and if a new user runs the wallet they might connect to network number one and all transactions from or to an exchange will
get lost. I only lost 2x 100 coins in a test transaction.

Thats the reason why people will just buy ripple.