Hi everyone. Thanks all for sharing your ideas and solution. 👍
I just discovered that 2024 is now versionless! Good, thanks Sketchup developers.
I guess this will apply to older versions after 2021.
I only tested with 2023 and it can open without issues. I dont have legacy programs anymore so I cannot comment about it. http://help.sketchup.com/en/release-notes/sketchup-desktop-20240
@Dave-R Got it! Thanks Dave...it did seem like overkill to lock both the viewport and the layers, but it seemed like one of my viewports was shifting (even though camera positions weren't changed) and I thought maybe I had been double-clicking into the viewport(s) w/o realizing it. Still not sure what I did, but it seems to be working now.