Same problem here, no bank mode access in the ASB since the Win 10 update a week or so ago. Additionally, Avast fails every time while attempting to check for updates via the About Avast SafeZone 4.58 page.
-Avast reports as protected.
-Avast can be started from the system tray.
-multiple Avast processes running as shown within Task Manager, including AvastNM.exe
Win10 Home Edition v10.0.17134 Build 17134
Avast Free Antivirus v18.4.2338 Build 18.4.3895.325
Virus Def v18064-8
-gcs01
The question asked was "Can you start Bank Mode from the system tray"
The update function in Safe Zone Browser isn't working yet.
That would be a negative. Actually, Bank Mode can be opened via the system tray, opened as confirmed in the lower right, but it is a blank screen...same as trying to open it directly from within ASB.
-gcs01