Thanks for the replies.
ady4um, thanks for the suggestion, I don't think it was taking any longer than usual to do the quick scan, it takes only a few minutes even the first time it is run in a day.
Quote: spg SCOTT
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"Odd...normally it only shows when you start a scan and then close the GUI (it pops up, where it can be pinned or left to disappear)
You normally don't see it when the gui is open..."
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I also thought it was odd, I have never seen this message before, or since.
When doing a quick scan, I always have the main avast window open, to see the progress.
I did another quick scan a few minutes later, after the update, and the message didn't show up that time.
I've done several quick scans (to see if the message would appear) and a boot scan since the gray popup showed up, and I've not seen it again.
It did seem odd that it showed up like that, the gui was definitely open, I leave it open until the quick scan is complete, and I remember closing the window after the popup went.
The pop up did show just as the scan finished, saying that the scan was complete, and no threat was found.
Could it have been a short lived part of an update, that was changed in the next update?
I've not heard of malware that creates such avast type popups as a scan ends, has anyone else?
Many Thanks