Hi straightedge
Avast will never use Avast Free ( or Paid ) users for Beta testing withought their approval.
You have to download - and install a Beta yourself first, to become a Beta tester.
The availability of the Sandbox and other paid functions in Avast Free was a bug, that should have been fixed.
That said, your screenshot is strange : It looks like kind of the same bug, but the other way around.
Could you try a repeair of Avast to see if that helps ?
1) Start - Control Panel - Add/Remove Programs - Avast - Change.
2) Repair.
3) Follow the instructions.
4) Reboot.
Greetz, Red.