I have left Outlook 2007 running for 2 weeks now with the logging on (Outlook has not been closed for 2 weeks) and have not been able to repro the problem. However, other users have been encountering the issue (as have I with my laptop, which does not have logging enabled).
Something in the logging code is preventing the bug.
Has there been any updates on this? We are having the same issues with or without the logging enabled. I am pulling the log files today from the impacted users and will post them.