Original Post — Direct link

Pretty much the title, it's possible to log in through mobile/windows but not mac

External link →

Hi, sorry you are having this issue. We have identified this is affecting older versions of macOS and while we investigate we would advise you update to a more recent version if you can. Please see this article for more info:

https://support.runescape.com/hc/en-gb/articles/26606111659281--10-JUL-Some-Mac-players-unable-to-login