Official bladeRF forum

I can't run gqrx with BladeRF 2.0. It works nice with old BldeRF, but with new nothing happens when I'm pressing "Start" button.
I've tried with gqrx 6.3.0 from debian stretch and with latest gqrx build from sources.
BladeRF 2.0 works ok with other apps.

Your version of gr-osmosdr may be outdated. Your best bet is to build from source either using PyBOMBS (easiest) or manually. Have you checked out our Getting Started: Linux Wiki page?

Before building from source, I recommend removing all bladeRF, gqrx, gnuradio, etc. packages from your system via your package manager (to avoid any potential conflicts).