Are problems likely if I have the latest version of whatsapp and they haven't updated it? I have two convos that have grey ticks from days ago which is unusual unless they are both insanely busy but at least one of them usually replies quite quick. One of them I know uninstalled whatsapp and installed an older version recently. One of these convos is quite important. Sorry I posted this in tech but it seems that is not very popular 😆