I'm using the data view to query opens for the last 30 days. It's been working for the past 2 months.
My devs just re-wrote our HTML based email with it's ampscript but the code is still there. I performed the same test as always, changing the EmailID, then sending myself the email, but this time no opens are being picked up by the query.
Any clue? This is quite urgent - my go live is Tuesday and this was working all the time before!!!!