If someone could help me with a distressing problem I'd be most grateful!
For the last month my WP site has had unwanted popups - click any of the buttons, links or menu items and occasionally a popup ad will appear saying CONGRATULATIONS and offering the viewer a free grocery voucher if they click 'OK' (I've never clicked it!).
I've tried disabling all my plugins to no avail, then tried a plethora of 'malware scanning' plugins but the problem persists. Would any of you clever folk know of a way to locate and eradicate this problem?
My site is at: http://lostvalleyoflondon.com/
(It's part of a multisite installation but the problem only occurs on this particular site, none of the others).