1) Make sure you're on the latest release https://github.com/syscoin/blockmarket-desktop-public/releases/


2) Try shutting it down and waiting a full minute before starting up again. 


In most cases, this solves the issue. 


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If this does not solve the issue then:


1) Close the wallet
2) Find your Data Folder:

The Data Folder on Windows is C:\Users\[USERNAME]\AppData\Roaming\Syscoin

The Data Folder on Mac is /Users/[USERNAME]/Library/Application Support/Syscoin

Rename the Data Folder: Sycoin-Old 

(This step simply moves the files. This will be your backup)


3) Create a new, empty folder called: Syscoin


4) Copy wallet.dat from the Syscoin-Old folder to the new Syscoin folder.


5) Restart the wallet and wait for it to sync up again.


There is a green bar on the Overview page that indicates syncing progress.