We have been using Print Inspector for monitoring a HP 2420 printer and we have noticed that some print jobs are not captured by this software. We are able to see print events in Event Viewer, but it is not logged in Print Inspector database.
I picked up a similar problem last night evaluating the software. I am using an SQL database. I noticed that on inspection of the log file, certain entries were not logged to the log table. Increasing the column width for [DocName] to varchar(1024) solved my problem. Normally, the default width would suffice, however, when printing E-mail, a larger width is required.