Ooops! Would never of happened on the old Heckler I tell you
Managed to crack my downtube all the way round on my 2006 Heckler (old style). Didn't complain or make any noise, the only way I picked up on it was that when powering up over the rocky slabs on the final descent of the ClimachX trail the bike felt like the rear wheel was trying to pull out of the drop outs. Held together for the blast down the final descent though :o). No real reason for it to go where it did, near where the swing arm attaches, but LBS reckoned it may have just been fatigue as I was riding it 3-5 times a week and 15-50 miles a go.
Mine went in exactly the same place. It was after 1.5 seasons of guiding in the Alps on it, so I've just put it down to fatigue as well.