The contents of the list of MIME entities (on the right hand side of the
message view window) are not visible.  They do seem to receive tap events and
change the message view accordingly though (several tries may be required to
hit just the right spot).

I also think the list is not scrollable (using the arrow buttons at the bottom
which appear greyed out), but it's hard to tell without seeing it.

This is best demonstrated on a message with several entities such as a MIME
format mailing list digest, but any message should have at least two MIME
entities listed.

If one taps at *just* the right spot near the thin line at the top of the list,
another MIME entity list appears as a pane above the message view, and that one
works fine (but a bit suboptimal as it uses too much screen real estate).

The "desktop" version works fine (tested on Ubuntu 8.04).