Why does VP create a {unique} constraint on use case associations?

This just started happening after restarting VP to configure key-board shortcuts and I have no idea how to get rid of it. Till now I was getting regular associations and now they are being annotated with {unique} constraints. How do I get rid of it?

This problem had been fixed and please follow the link below to update the application to latest patch to get the fix.

Best regards,
Rain Wong