Sorry for the BIG quote - just want to keep track of this. I have a workaround for me and maybe a pointer for Alwil as to where the colours are ‘clashing’ with the Silver colour scheme. The images are self explanatory, except to say that with the ‘Blue’ scheme the colours (light / dark) are inverted in this colour setting. By changing them around appropriately in the Silver scheme (inverting them in a similar way to the Blue scheme) the problem is solved! With this setting I now get ‘perfectly formed’ messages from the Avast in Outlook. You should offer me a job as a Product / Usability / Interface tester… ;D