I was running the premium trial and was on the old navigation.
I switched to free and then was forced into the new navigation with no option to turn it off.
In the old navigation I was able to go into the Summary page of a project and drill down in every card to get a task/user story list.
Now in the new navigation I am greeted with this page for every drill-down in the Summary page.
Answering my own question:
Add the List tab to the project page, per my earlier comment, and it starts working again.
Are you using some bookmarks that are no longer valid?
Can you clear your browser cache and try again to see if issue is resolved?
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I just cleared the browser cache (I also tried a different browser I had not used JIRA on before), then went straight to jira.atlassian.net (no bookmarks).
I logged back into JIRA then navigated using the normal project/summary areas.
I ended up with the same result.
I can see the cards, just drilling down into them give the 404 error.
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I was playing around with it more and looked at the link for a drilldown.
I noticed it was going to a "list" in the project.
After adding the List tab to the project page it started working!
So if the List tab isn't on the project page, then the drilldowns that go to the list page will not work.
Since it doesn't put the list tab on the project page by default it seems like an oversight.
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