Currently, Toodledo only supports sending reminders to one Apple device at a time. Before the iPad existed, this wasn't really an issue, but now people can have both an iPhone and an iPad with Toodledo installed.
Currently, the reminder will be sent to the last device that you used with Toodledo. So, if your new iPad was the last device that ran the Toodledo app, it will be the only one to get the popup alarm reminders. We are working hard to make this so that all of your Apple devices will receive the reminder.
We have only had our iPads for a few hours (like everyone), so please bear with is as we get this working.