Its now becoming clearer to me as to how the scheduling system is operating, and having had a re-read in the User Manual, I do see you specify to make that insertion (Insert as Regular Playlist Tracks) for large Playlists.
Not especially large, it's intended for music playlists mostly.
(1) Is the Daily Log saved somewhere ? As an option in settings to save it ? As a text file perhaps ?
Its my main resource for solving problems when things go wrong, and frustrating to have to scroll thru that tiny box all the time.
It's saved in the reports folder - click Settings->Open Reports folder to open it.
And also when we had two planned power cuts for maintenance a few days ago, nothing seems to be retained from earlier in that day, with the Daily Log starting from scratch again.
The log window only shows up to 2 past days, and the number of items is also limited to prevent scrolling problems.
I also want to work out why I need to create a 15 hour playlist to fit 12 hours too, particularly when so many scheduled events are taking place (fitting within the 12 hour playlist),
Please make sure that you account crossfades when you creating a playlist (it's in the playlist generator settings tab). Other than that, you typically only need to have playlist 30-60 minutes larger, just in case. 3 hours is too much.
Also make sure that "Read additional information" is also enabled in the playlist generator.
3) Are there any plans for Playlist Gen to create just one Playlist automatically broken down into 24 one hour segments, much more suited to recording voice-tracking, and which starts off each hour on the dot leaving behind unused surplus tracks from the previous hour ?
You can either create one 25h playlist, or 24 1-hour playlists, both is possible currently. When you create 24 playlists in one go, they all share the same no-repeat buffer, so it's better (and faster) to create all playlists in one go, than creating a new playlist every hour.