For the lasts 2 weeks, every time I add a new task the pop up doesn't disappear like it used to. Now I have to x out of it whereas before, when I hit save it disappeared.
we're very sorry for the inconvenience, it's an issue that we're working on right now. It seems to occur only if the default date format you're using (in the Preferences -> General) is MM/DD and only if you're adding tasks using the Quick Add feature.
For now, as a workaround, you could try to add tasks from within a project. Simply enter the project you want to add a task first and then click on the "Add task" link at the bottom of the page. This will also allow you to quickly add multiple tasks one after another while in project view.
this issue has been fixed. Using the "Quick Add" feature will now no longer redirect to the incorrect page and will properly close the input box.