Are you refering to jukeboxes playing music, or the natural music?
If jukeboxes, I could not reproduce. If natural music, probably not a bug, as it has been around since I have been playing (1.1).
It shouldn't take people long to find the vote button if they are observant. Please don't create invalid bug reports.
I managed to reproduce. The Mushroom bug has been reported seperatly though.
I managed to recreate this on a world with default Survival, AllowCheats off, where there is no work-around. Should I change the gamemode description to "None"?
I'm pretty sure this is intended behavior because of the way coordinates are defined. The middle of a block is its distance from 0 + .5
Otherwise you would be teleported to the edge of a block.
Reproduced bug, Dev console outputed same "Can't keep up" message for me. If I save and quit to title and then reload, a mass of mobs will spawn for the first few seconds before the problem recurs. However, I have also noted a complette absence of squids except when I log on initially or reload.