Not sure on the square or round tube frame.
The first aluminum subframe I had got bent up and to the right (looking from rear) and cracked around the pipe loop. The second, I'm not sure yet as I havn't seen it. I rode it, bent it and gave it to my brother to store while I went to Korea and he said he'd take the bike apart while I was gone and let me rebuild it when I get back. This weekend I start the rebuild and I'll see how bad and where it bent.