DVD ISO and TS_VIDEO folder

I have several DVD ISO files, as well as DVD TS_VIDEO folders (ISO file contents copied to hard disk).

Some play okay if you let them run from the start. Others only show a black screen.

For all, trying to use the DVD menus (via the DVD Menu icon) fails miserably. So my questions are:

1) is XBMC supposed to handle both of these types of files?

2) if so, how do I make them work properly.

Any help greatly appreciated.

TIA

ken