Happens to me as well. I first noticed it in 14w07, but it still happens in 14w08
My smooth lighting is set to maximum.
Confirmed.
Confirmed.
I can confirm this, too.
Happens to me in the latest snapshots for 1.8 as well (14w05, 14w06 etc).
Happens in 14w06b as well.
Confirmed; all of my 31 or so item frames flew off the wall, along with their items, immediately on loading up the snapshot 14w05b and when I put them back up they are emitting the same particles shown in the pics now.
It is similar to the torch particle bug that I also reported, but since you can only report one issue per bug, I decided to make it a separate report and I couldn't find it by searching so I don't think it's been reported yet. It's kind of hard to notice right off the bat. I didn't notice it until hours of playing 14w08a.