Question box dissapeared

Problem

John C. asked:

I have had SuperMemo 2000 for about 2 weeks, and I have entered a few hundred words of French vocabulary. I discovered that one element (the word "although") was duplicated, so I clicked to delete it. A box came up saying something like "do you want to delete all elements with the same template, or just this one". I was careful to check the box which said "only this element". To my horror, I then found that the top half of each element (i.e. the question) had been deleted for every single element. The top box wasn't just blank, it had disappeared altogether.

Could you please tell me how I can recover. I'm scared to touch it, as it seems that it’s very easy to screw things up completely by clicking the wrong button. Fortunately I have been careful to back it up.

Alternatively, can the damage be undone without using the backup?

Answer

This looks like a typical symptom of deleting the answer component from your default template. Try to define the template again or re-apply a correct template to the "damaged" elements