System.Security hangs G120 with 4.2.7.0

If System.Security is added as reference to a 4.2.7.0 G120 project the application hangs forever before entering main(), deadlock!

I need to reflash the G120 to be able to deploy the device again :frowning:

I had some similar problems when receiving my G120 HDR, but reflashing with the QFE2 make it right now !