When you attempt to print or preview a report, Epicor 9 submits the request back to the server. The server handles the creation of the report, and asynchronoously sends it back to the client.
If the server can not generate the report, the most common reason being no matching records, it generates and error, and does not inform the client why.
If it seems like your print, or print preview is taking too long, you have to use the Epicor System Monitor taskbar application to find out why. In the bottom right of your Windows Star Bar, click in the Epicor icon. You'll find you report request under eith Active Tasks (if in progress), or History Tasks is it has already failed.
Once you've selected the task for the List tab, click the Details tab to see the error reason:
Message:No Records Selected.