1. Make sure you have the latest wallet version.
2. Make sure your Firewall or Anti Virus software do not block wallet connections.
3. Make sure your system’s clock is accurate.
4. Coins take around 30 minutes (~11 Blocks) to mature.
5. Wallet will create his own peer circle. It takes time. However you can help the wallet with giving it a list of nodes: To apply addnode, you have to find your blackcoin.conf. It should be here:
Windows: %APPDATA%\OTOCASH\
Linux: $HOME/.bitcoin/
Mac OSX: $HOME/Library/Application Support/OTOCASH/
Then go to https://www.otocash.io/otocash_documentation/add-node/
Click on “node list”
Copy the whole list to the end of otocash.conf
Start OTOCASH-Qt
* Sometimes OS hides file extensions so check if a .conf is not actually .conf.txt
If you still receiving problems, check your debug.log.

WHATEVER YOU DO, BACKUP YOUR WALLET.DAT!