Have you installed any 'ad-blocker' programs on the machine you are having problems, and also the other machines?.
Do you use Avast, and you do, did the recent Avast update advice that you download Abode Air, and you installed that?.
This thread is now locked and can not be replied to.
Best Black Friday deals 2015 live blog: Best UK Black Friday deals & best UK Black Friday tech…
1995-2015: How technology has changed the world in 20 years
HDR video: Everything you need to know
20 Mac Power User Tricks... That You Didn't Know
Synology invites you to visit them at IP EXPO - Europe’s number one IT event on 7th-8th October. Register HERE for free and join them at stand DD8