Here's what I've done. Burning ROM, not the express mode.
Start nero, choose DVD-Video project option.
Choose what options you like (the defaults work, but I turn off the large filenames and stuff that might lead to incompatibility).
What you get is a destination directory on the left which has a VIDEO_TS directory.
Choose the Video_TS directory.
Now, drag the files in your hard drive's VIDEO_TS directory into that one.