Paul has give you one idea. If that's not the problem, it might be that you're stuffing something into the keyboard buffer. You can put a CLEAR TYPEAHEAD before your REPORT FORM command to see it that's it.

>Thanks for the help everyone.x
>
>OK, I now have it set to:
>REPORT FORM (ConvFilename(Reports.filname)) TO PRINTER PROMPT PREVIEW
>
>But the point was...
>
>When I print some reports not all:
>The preview screen popsup briefly then closes...
>Then I need to issue the above command a second time.
>Then the preview comes up just fine...
>
>This only happens on some reports and I would like to know why...
>
>Thanks for your help...