@Brett_Gerhardi, thanks for writing in! As you’ve noticed, we did make a change to our Advanced Search functionality. It’s actually unintended behavior that “Due Date within the next 1 days” would show overdue Tasks, as it should just show Tasks due in the next 1 day, so the change was fixing a persistent bug in the product.
If you’re looking for a search that will show overdue Tasks, try Due Date within the Last X days (which can be up to 100 months). Since it sounds like you’re working out of a single Project, you could also sort the Project by Due Date, which will show you the Tasks in your Project chronologically (with Overdue Tasks at the top). Let me know what you think!