Customize View does not add To or From fields

I have several email messages linked to a business project but by default,
the To and From fields were omitted in the History tab. I added them by
Customizing Current View and they are added to the table. However the actual
data for each entry is not there. In my case, for each email message, the To
and From columns are now blank. I know that some columns do work correctly
(subject and received date column were defaults and I've added the category
and importance column and they worked just fine). What is going on with the
To and From column? (also, the Attachment column doesn't work)

Thanks,

Craig