I know we have seen some issues when adding a "new device" to your PC. When Windows sends a message that a "new device" has shown up (it can be a PRINTER or a USB drive, not just something related to a PLC), Designer attempts to resolve that device, and sometimes it "hangs"

I had fixed some old code for 2.11 that apparently does not work properly. I have addressed that and we are looking to ship a 2.11.2 soon.
In the meantime, I recommend that you power up any USB bench PLCs or USB to Ethernet or VPN connections, or connect any USB drivers or printers BEFORE launching Designer. So sorry.