I have downloaded the "MasterchestWalletAlpha_Bin.zip" once yesterday, and 3 times today, from the "Windows Wallet" link at
http://www.mastercoinwallets.org/. The files extract just fine using either 7-zip or WinZip. But when I try to run the "Masterchest_Wallet.exe" program, my Norton deletes it, and gives me a message that the file contained the "SONAR.Heuristic.120" trojan.
I am still successfully using the "MasterchestWalletAlpha_Bin.zip" that I downloaded mid-March. But I wanted to update it.
Any ideas anyone?

EDIT: Okay, the same thing happens when I download the download zip from github at
https://github.com/zathras-crypto/masterchest-wallet.
EDIT: I haven't determined what the problem was, so I bypassed Symantec. We'll see. Mastercoin works just fine.
I ran the computer using a Linux OS off a USB Flash drive. It seems to have deleted the anomaly.
I ran this through virustotal and wasn't able to see any issues - I actually recommend putting an exception in for any resident shield or network proxy, as if it proxies all the network requests (RPC) to bitcoind/qt it slows things down by >50%.