Yes, I expected to lose all the preferences on a clean install, but my problem is deeper than that:
1. I can look through the /library/preferences but I see no reference to anything from Rumlog
2. More importantly perhaps, Rumlog is not saving its preferences on exit, because when I start Rumlog again, it does not know the log file or any of the other information saved from the previous session.
And then, there is still the problem that I cannot connect to the K3.
I do have the same version of Rumlog running without any problems at all on my Macbook, also running under Lion.
That is why I am confused!