I have just tested it in different modes, using stylus for reliability, and here are the results:

1. Textual list:
Left edge always works. The list itself (i.e. items) works sometimes but rarely, the right edge (where scrollbar appears) never works.

2. Album covers (small):
Scrolling works.

3. Album covers (large):
Scrolling does not work, but clicking on left/right screen edges scrolls covers.
important: scrolling through a list of songs that shows to the right of the album cover works in this mode.

4. Photos (small):
Scrolling works.

5. Photos (large):
Scrolling does not work (opens current photo), but clicing on left/right screen edges scrolls covers.