Repeating "No tasks" message
It's a little cosmetic bug. If you refresh the page it's OK.
The problem is that when you are adding tasks in an empty project, you are in "Add task mode". This way, you can check as complete task for last task in project, showing "No tasks" message. You are still in "add task mode". You can entry another task to the again empty project. Check complete and repeat again. If you repeat this operation 4 times, you will have "No tasks" message 4 times. It can be a bit confusing. For example: Make a new project "TEST". Inside, add task "test1" and check complete. Number of tasks in "TEST" is 0. Add task "test2". Check complete. You have 0 tasks and "No tasks" message twice. If you uncheck "test1" or "test2" you will have "No tasks" message twice.
I'd tryed on Firefox 3.6 and Chrome. All the time I was using the mouse, not keyboard shortcuts.
I hope my explanation is clear.