Please tell us what you're trying to accomplish, Peter, & give us some details. Here's some background in case it helps at all...

When you create a DVD layout with DVDA or most other (99% +) authoring programs, the software includes some built-in scripting & structure that's always there in every DVD that program creates. When you add features - buttons, actions etc - values in that same scripting change. When you add menus or video content etc, parts of that routine structure are repeated. When you add scripting, it's inserted *into* that regular structure -- it's inserted into the same built-in scripting that the program always uses. PGCEdit, an excellent free-ware program you can download at videohelp.com, lets you see & trace the scripting itself.

If your DVD doesn't work as intended, there's a bunch of possibilities... Yes, there are some (mostly minor) glitches in DVDA, & they're covered pretty much in older threads in this forum. More often, the problem is with the players themselves - almost all software players have features they won't handle, along with some bugs. Set-top players usually have features they don't support, plus they have limited amounts of memory - not enough memory to handle certain things. These external players also have their own settings they consider more important then anything the DVD tells them, and they can try to do things automatically for you.

When you add your own scripting, it may not be inserted where you thought. The scripting may not work, or, it may create demands that the player can't handle. It may break one or more rules according to DVD spec, or the player may not support everything in the DVD spec - most don't. Your scripting can conflict with what DVDA already put down. You can also get into trouble if you try to include something that DVDA just doesn't support - it's not Scenarist, but then it only costs a small fraction of what that program goes for.