Hello Rolf,
Sorry for the late response, I just came back from vacation today. I was using SAP 7.20 on OS X 10.6 without any issues until the Java update 15 so I am positive that SAP 7.20 works on OS X 10.6 as I used it for more than a year. As you have stated, I was unable to login after Apple automatically installed the Java update 15. So, I downloaded the Version 7.30 to see if that will resolve the problem but I am still unable figure out what I am supposed to do to get this working. Since there is no proper way to go back to the previous version of Java, I am stuck at this moment and Time Machine was off in my Mac due to which I am not able to restore to an earlier date before the update.
I do not have a marketplace login and could not view the thread "Note 1758540...".
Thanks for your feedback, I guess I most likely would have to go back to the previous version of Java by using one of the crude methods suggested by some users in other forums.