Program in Sandboxie no longer work once I add My Documents as a ClosedKeyPath

I am using Windows 7. For some reason, as soon as I add the following ClosedKeyPath to Sandboxie settings:

 

ClosedFilePath=C:\Users\[User Name]\Documents\

 

No .exe file will launch anymore. If I launch executable any at all, I get this error:

 

SBIE2314 Canceling process program.exe

 

No other ClosedKeyPath does this. Only closing the documents does this, and it does it every time

 

Anyone know what the problem is?