Ok...weird issue, here. When I go to my Project Tasks list:
I get a very generic error with only an option to manage web parts. There are no site settings, options to add a web part, or anything. It's completely gone. However, if I go to the default Change Management workspace:
the web part for Project Tasks is visible (as well as the Gantt chart), as well as all the tasks. I can click on each one and get to it with no issues. I'm not understanding what the issue is. If I mouse over the Project Tasks heading, I get the same URL as the one that's broken. Can someone please assist? Any help would be greatly appreciated.