Part of this is concern over Europe (nothing new), fears of suddenly plentiful and cheap oil (overblown IMO) and a slowing economy.
Tie it together with a highly leveraged balance sheet, no earnings since 1QTR 2009, uncertainty about operations and a tired low-volume trading environment and you'll get what we have today.
My take - if you're not top heavy in ATP shares in ones portfolio - to have patience - go cut the grass, turn off the d@#m computer and don't lose sleep over what we can't control anyway.
Despite some complaints on this board about ATP management, I've still noticed a more professional attitude from them since early Spring. Making mistakes is OK, not learning from them is not. I think they're learning.