Goto account management, press triangle, select "Comment", erase everything there and try it again, your list will come back after that. This has happened on previous firmware versions too.

Oh in the newest 2.80 firmware "Comment" appears when you triangle over your user avatar in the friends list instead of in Account management where it used to be in version 2.6 and stuff.
So just clear your comments and then log back in and it should be fixed. Known bug from previous fw releases that still hasn't been fixed.