The best way to see if you are on the right chain is to check one of the explorers.
http://Chainz.cryptoid.info/uno or http://insight-uno.cryptap.us/, for example.
Check the number associated with the "Block height."
Then, check which block your Uno wallet is on. To do this, open your wallet and go to Console > Information
Get the "current number of blocks." If your wallet agrees with the explorer, you are on the correct chain.
Now, explorers can certainly be on the wrong chain. But from what I am seeing in this case, Uno's explorers are correct and in agreement. They have been compiled for Linux from the code in Github. Most if not all pools, exchanges and services for Uno are run on Linux and have now been compiled from the current source. Your Windows and Mac wallets are off because they have not yet been compiled with the latest changes. We are awaiting the delivery of the new Windows/Mac wallets, which will agree with the block explorers and the exchanges.
If the explorer is right then my wallet is wrong. So should I just wait for an updated Mac wallet? In the meantime I have 25 UNO hovering about that I can't use.
Back up your wallet.dat as a precaution. Copy it to a usb stick or someplace secure.