Here are the following bugs I've noticed from my experience,
-The UI is very glitchy. In a period of an hour, my DX50 has frozen 6 times. All of which were fixed by powering the unit down.
-When charging the DX50, the computer will NOT recognize the device if you plug it in with the DX50 off and constantly plays the usb notification sound. If you plug it in when the DX50 is on, there seems to be no issue.
-Korean/some Japanese Text not displayed whatsoever. Instead they are replaced by blank spaces.*EDIT: It appears that some of my japanese songs have a little messy tags but I'd really like to not have this issue where tags are so important for playback.
-Someone stated earlier that the DX50 could not remember their previous volume configuration but mine seems to not have this problem.
-My left button does not click very well. It feels like the other two buttons are more recessed than my left one.
-Scrolling is not very smooth but still manageable
-Some of my songs are not playable(They do not contain ' in the title or in tags)
-Not sure why my DX50 has the need to constantly perform a media scan everytime I boot up even when I haven't added any songs.
A big problem for me is that this player sometimes works with my car auxiliary port and sometimes it doesn't. I'm having a hard time figuring out what triggers this.
From my personal experience so far it seems that if you plug in the aux cable AFTER the unit has turned on, it won't work. If you plug in the aux cable before the unit turns on, SOMETIMES it works.