I pretty much just figured out how to use the basics of Encore an hour ago, so bear with me.
I'm only working in the flowchart panel, nowhere else. I wanted to add a short animated entrance for the play button on the menu (I refused to do it in Encore), so I took the menu PSD and animated the button in premiere. I then had the project flow as such: Project>Premiere Clip>Menu. In between the Premiere Clip and Menu, there is a short pause where the screen goes black. I'm barely able to manage the workflow in Encore and I'm hopelessly confused please help! I worried that when I finish up the DVD that the gap will be there.
You will probably not know until you test a burned disk on a dvd player. The Encore preview gap is not a reliable indicator, and probably cannot be, of the disk outcome.
Test methods include RW disks so you don't waste disks. Also, burn to a folder and play with a software player. None of these will guarantee no gaps.