Hi and thanks for your reply, however, I think I need to clarify. I am not only wanting to have hybrid mode be the default view for new users preferences when they register for an account (my understanding is that is what your instructions will do), but rather, what I mean is, I want hybrid mode to come up as the default view even for UNregistered guests who have no account and are viewing while not logged in. Right now I can only set that to either "threaded" or "linear" in admincp, there is no option apparent to select hybrid as the default for users viewing with no account. The thread I found searching here suggests editing sessions.php or later sessionid.php and changing the value of $threadedmode= from 0 to 2. However in my version I cannot find either such file anywhere...

Thanks in advance for any reply
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fwiw I am working with version 3.7.0 beta 4 and soon updating to 3.7.2 PL2, if that helps