I'm not sure what to say... I have opened the file twice - on my PC at home, and now on my Mac at work. Both times, it asked me if I wanted to enable macros, and I selected Yes. I then deleted the data already in columns A and B, then started adding letters and numbers to column A. Every time I hit enter to input a value in column A, the timestamp of that entry appears in column B. I'll forward the issue on to some other guru's here on the forum to see what they have to say...

- Moo