Well, unfortunately I'm back.
Yesterday, I used brundlefly's suggestion for trimming the beginning of the song, which worked perfectly. But, I couldn't seem to get that method to work with trimming the end of the song.
I then found the "Stop at Project End" pull-down and enabled it, and that did the trick during playback. The start/end of the song was also being respected perfectly during audio exports.
So, I came back today to do some additional mixing on the existing tracks, and for some reason when I do an export now it's including the blank space at the end of the song again. The weird part is, when I play the mix back completely before the export, it still does indeed stop at the proper place as it did yesterday... The end of the last track with sound.
I finally wound up doing a work-around using the From=Now, Thru=Now feature to mark the timeline with exactly what I wanted to export, and after that the song exported properly with the beginning/end trimming in the correct places. The problem with this method seems to be, even if the mixing project is saved, the next time you open it those marks are gone and you have to go through creating them all over again. Shouldn't they be saved along with the rest of the project?
I was thinking I might have fat fingered some option along the way today since everything was working fine yesterday, but I'll be damned if I can figure out what it may have been, if anything. I also reviewed the event list, and it's totally empty as I expected it to be, since I didn't create any.
Any ideas where I may have gone wrong here now, or some other things to check?
P.S. Yes, I started reading the 2,000+ page reference manual last night, and fortunately was able to skip a lot of it since I'm not using Cakewalk for recording, video, or any MIDI work. I'll get through it all eventually, and hopefully stop bugging you guys so much here! ;^)