I’ve read about the issue some months ago and thought it’s already fixed in the sim…
Also the issue that you load up and despite turning on Bat+Alt the PFD remains black just occured to me. Setting Avionics Master to On turns on the MFD but it shows only some outlines of the display structure and a green circle, but no dynamic data at all.
This seems to be the “Known Issue” of the SU3 where the only workaround is to restart the sim.
Pretty annoying, again more broken than fixed with my favorite aircraft/system 
