Hi,
I haven't tried those particular cases but I will. Overall, I think that the gapless function works much better than before. What I have noticed is that having gapless on, sometimes when you change to a track in a different album, before the new track starts you hear a second or so of the music from the previous track. It sounds as if some sort of buffer isn't properly managed before changing to the new track that doesn't belong to the same album. This already happened with FW 1.5.
Now, with FW 1.6, the skipping of tracks is much more fluent and glitches and pops rarely occur, but the response of the play/pause button still is way too slow and occasionally causes popping sounds.
Also, when playing songs in shuffle mode you still cannot go back to a previous song because the back button plays a new random song instead of repeating the song. This little problem is very disturbing for me because I like playing songs randomly and being able to repeat the songs I like.
And again, no track number shown.
So far I'm satisfied with this new firmware because at least they are trying to solve the problems that we have. But I wonder if they ever take a look at forums like this because these bugs are well known among owners of the DX50 and could have been solved all at once. And some of them must be really easy to fix.