I've had this problem for a little while now (can't recall what would have triggered it). I'm using Safari 6.0.5 on 10.8.4 on an early 2011 15" MBP. When I try to copy anything using the keyboard ...
I created a new Google doc on my iPad2. When I select all to copy the whole contents, it only selects the current line. Is there a known workaround for this?