Just had a weird issue where:
on the settings panel (left side), the thumbnail image of my file appeared correct and complete.
on the bed image/preview, only some of the paths were drawn.
I told it to cut anyway, and in fact only the fully-drawn paths were cut. So the preview was correct.
Um, why? The original source file is a DXF, so there are quite a lot of individual paths in the file, but I’ve cut more complex images before without issue. Interestingly, the smaller gears were cut first, so it doesn’t seem like I just ran out of memory at the end or something…