Was working perfectly before the last hotfix on the 26th, went to load a short hop form KGSP-KATL and when the aircraft loaded it was like it was cold & dark.  Normally not a problem, following the normal start up procedure the batteries would not work and the EFB would not click on.  I uninstalled and reinstalled and now the CRJ is not even showing in the sim.  Windows Defender and Realtime protection is of as well because of the install conflicts.   Ideas?   Thanks!  Stoneman101