Actually, thinking about it again, I might have been too quick to blame myself (or not

).
When I load in my Star Wars sequence from last Xmas (in the mac version 2016.23) and play it in the preview window, all the effects show as originally sequenced. If I then click on an effect in my sequence, the effect settings window shows all the parameters for that effect setup to make that effect appear as it does in the sequence, i.e. if I click on a butterfly effect or single strand effect etc in the sequence grid, I can see all the settings in the effect settings window setup correctly to create the desired look in the preview window.
But it is different for the wave effect because, as per my video above, if I click on the wave effect on my roof group in the sequence, after a few seconds, the effect on the roofline disappears and subsequent wave effects don't show up in the sequence being played. I said "forget the above - user error" because after then adjusting all the various parameters in the wave effect settings window, I was able to get roughly desired lighting effect on the roofline to appear again... but I didn't think I should I have to do that? Shouldn't the settings for that wave effect in the sequence show up as originally setup when I did the original sequence? - that seems to be true for all the other effects I click on in the Star Wars sequence but not for the wave effect.
My apologies if this has been addressed already - I'm just getting back into the sequencing more for this year and trying to keep up with the rapid rate of amazing updates and enhancements that the xlights team has been implementing.