10.1.4588 - Permenant "Some messages are still uncategorised"

Having upgraded from an earlier build of 10 (I always do upgrades when recommended so assume it was the release just prior to the new one) to 10.1.4588 I now have a permenant notice at the top:

However there is no notice of categorisation going on

eM Client has been running continuously for 4 days.

Is this a bug or is there really some silent categorisation on going, even though I only have 20 messages in my combined inboxes??

I’d be very glad to be able to dismiss the notification.

Thanks
Andrew