>>2) Several users have reported errors if a grid was selected when running the report. If this is the case, try to select another object on your form, and THEN run the report.
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>Ok, this is the layout of our form. A grid, which the user dblclick and fire the click event of a print button from which the report is executed. We use this layout in all of our applications and this is the first time ever we get this kind of error. BTW, we're using VFP 6 with no service pack. Do you think that might be the problem?

You should definitely install SP, but the problem with grids is more generic. You were lucky, you were not hit by it before. The simple solution would be to move focus out of the grid and after report form restore it back. Another solution would be to create a private DS for running report. However, this is much harder...