Launch IFOEdit, and then open up the IFO files in it.
The one(s) that we should be looking at are the VTS_xx_x.IFO files.
One of these - when you first open the IFO file (do not select anything at all in the upper half of the window) will clearly state where the break is.
You will know you are in the right screen when you can see across the top the wording
"VTS Overview" in the decription column.
If you get stuck, you can always send me the IFO files and I will tell you where the break is.....