Thanks, I have tested those configurations. The lightbox is about the only setting that works (reasonably) with 6.0.1 at least (slider is somehow broken, again not sure if this is due to X or WC), but the new ligthbox looks very crummy and has some usability issues (such as missing the ribbon at the bottom of the light box). What is pretty OK with the new lightbox is that it works nicely with swipe on mobiles, in most other aspects it looks like a step back.
So still suggest that a lightbox which would combine the looks of the lightbox on 2.6 (on X) for the desktop and the functionality of the lightbox on mobile from WC3.3/X6.x (with some improvements to look/usability) would be nice add-on from X/Theme.co.
What would be super nice would be to be able to add videos so that some of the "images" could be videos would take the Product image gallery well into the 21st century
One can always dream.