Yes! Thanks Neil! That "sequence as a single file" I mentioned above is actually a nested sequence and no work had been lost (alas, too late for me, I had redone it already). Now I feel like a complete moron as I often use nested sequences and should have recognized the bright green colour. Anyway, in case anyone has this problem with CC2018 and is as confused as I was: 1) If you accidentally "save as" without changing the file name and the file automatically closes, and, when you reopen it, you find that the timeline is empty, 2) all you need to do is go to the Project Window, find the Sequence icon and DOUBLE CLICK on it. That should bring up the sequence in the timeline exactly as you saved it, no loss. 3) if instead of double clicking you drag the sequence icon to the timeline (as I tend to do, bad habit) AND if you happened to have the Nesting icon on the timeline active when the file closed, then your sequence will appear as one single video/audio clip (by default, I think, bright green). This is just the sequence, nested. Just double click on it to open it up as any nested sequence, or delete it and do step 2), or delete it, turn off the Nesting icon and drag the sequence back onto the timeline. In any case no work should have been lost, all that happened is that the file and sequence closed down when it "saved as" over itself... it's actually no big deal.
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