StephenYeo

Not sure. Messages go back several weeks, and there has been at least one MWB update during that time. And now that I think about it, one message that popped up on the screen but doesn's seem have been stored in the history talked about an issue with the Heap memory (sorry, should have screenshotted it, but was busy with a dealine so didn't pay as much attention to it as I should have.

Have experienced a similar issue over the past couple of days - strange behaviour with Excel and Powerpoint, and difficulties printing with Word. No problems printing from other apps or printing the printer test page from Windows though. Looking at Malwarebytes, it looks like I've had 5 or 6 messages since late August. Slight variations, but all the messages seem to involve "Exploit Office WMI abuse". Have applied the solution you rsuggest above & will report back.