Danbooru-based image board with a specialization in high-quality images.
anegasaki_nene love_plus rei wallpaper

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Pixiv maybe changed its refer mechanism recently. If the session you're using have not open pixiv yet, when you click a url like "http://www.pixiv.net/member_illust.php?mode=medium&illust_id=7649516 " from other site or address bar, it will require you to login even though you logined & saved the cookies. Then if you login there, it will redirect to the homepage of pixiv.. You have to click the link one more time to view the page you want.

To solve this question temporarily, you can open pixiv's homepage first when you launch browser..
not only images pages, seems any other links except user's my page on the site redirect to my page, or login page :/
past they removed many search options, and now they are removing direct access to the artists :/