I keep some bookmarks to quickly access certain sections, for example action > pages > last day pageviews table, last 30 day pageviews table and so on.
They are no longer working in Piwik 3.x, instead I am "returned" to main dashboard with widgets.
The URLs for the pages have simply been changed. You may need to recreate your shortcuts.
Thanks Stefan, already did it.
I've opened the issue just to be documented.