Before, there was an annoying popup dialog asking you to log in once you scrolled enough down the page.<p>Now, they are doing a server side 302 redirect to /accounts/login preventing you to see anything at all.<p>Only in a very few times you're able to see a page or two before the redirect. Not sure if they're allowing a give number of views per day per IP address or doing an A/B test.
This has been going on for months, maybe three or four. I don't have an Instagram account, these days when people send me links, I tend to not even click on them any more.