Goldmine contacts missing

It sounds like you're using GoldMine on a standalone PC, yes? Or are you on a network, sharing a database with other user?

Could be your database needs maintenance (i.e. File | Maintain Databases or Tools | Maintain Databases).

Or, if your report is actually based on a filter (could be internal to the report, if it's a custom report or modified report) it could be that these contacts no longer meet the criteria of the filter.

Goldmine is on a network, and only one user updates it. I only do monthly reports - I never add or remove. The user says she never deletes any contact, and I'm sure she wouldn't.
To generate my monthly report, in Goldmine, I go to Tools | Import/Export Wizard | Export Contact Records. Then I select five fields to be in the report, but specify no conditions whatsoever.
I will do the maintenance. This is still quite a mystery.

Its not a matter of criteria, because when I look up one of such contacts by name, the contact doesn't come up at all.

So the report you're generating is not in GoldMine? You mention that you export the data, and then run a report? What's the final report generation program? Crystal Reports? Excel? Access? Something else?

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Its not a matter of criteria, because when I look up one of such contacts by name, the contact doesn't come up at all.
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I infer from this that you can see the contact in GoldMine, but not in whatever you're exporting to -- is this right?

I export all contact records from Goldmine, but specify 5 fields to be displayed in the exported file - no criteria specified. Goldmine exports to a .dbf file, which I then view with Excel. In this month's report, I have narrowed down the missing contact to only one. No I need to find out exactly what happened to that one contact. The contact was in last month's report, but he's not in this month's report. I searched for him in Goldmine, he's not there either.

Are there any logs I could view to find out how this contact was removed?

Thanks. You're very helpful.