Ira

After owning every Serif product made, I added AD to my list. I had my first problem, I created a text box and entered a few words, so far so good. I wanted to change some test and deleted several letter and went to type new letters but was unable to do so. If I did Command Z, the letters returned. If I again deleted a few letters and tried to enter new letters, the cursor would just hand at the last letter that I didn't delete. I closed and restarted AD, the same thing happened. Any ideas? Ira