I haven't heard anything about technical problems with the tracker, and mine was working just now when I checked it. Those numbers will be filled in for you with some nutrients that either have set recommended daily amounts (like certain vitamins and minerals), or where the number is based on a percentage of your total calorie range (like grams of fat, protein, carbs). If there aren't set amounts or ranges for the particular nutrient you're adding, you'll need to fill in your own values. There are some reference articles in the Nutrition Resource Center that have info about recommended ranges for many nutrients, so you might be able to find the info you're looking for there.
Hope this helps.