Thank you for your reply.
Just to reiterate the problem, the system tray icon appears after a signing out and then signing back in. After the next power down, power up the icon does not appear. Disabling the FAST STARTUP in the power options causes the icon to appear all the time i.e. after a power down, power up. I am running the software in Windows 10 Pro Version 2004 OS Build 19041.50 Experience Pack 120.2212.31.0
I have attached the zip files you requested (one with icon and one without icon), screen shots of the system tray area (with and without icon) and a screen shot of the notification area icon settings showing that the Malwarebytes icon is switched on.
I look forward to hearing your analysis of this problem.
With thanks, Steve.
With-Icon-mbst-grab-results.zip
Without-Icon-mbst-grab-results.zip