I’m running into an issue where filled curves (intended for engraving) are filling space surrounded by the curves, and this is a problem. I just recently started to notice this in the past few days, and I’m not doing things differently than I have been, so I suspect this may be a new bug.
Affinity Designer. I’ve opened the SVG in a number of other pieces of software though, and they all correctly render the hole in the middle. Even the SVG at the bottom of my post is displayed correctly by Chrome.
I use AD, also. I just opened your SVG and it looked fine to me, but it loaded into the UI just as you said/showed. So, I made one myself…with a filled black circle and a second circle, no fill with a black stroke, then subtracted it out of the filled circle. I looked exactly like what you had made…and unfortunately, also loaded into the UI also exactly like it did for you. Weird.
It’s a perfectly valid SVG. Every web browser renders it fine.
It’s just yet another example showing that Glowforge doesn’t support both fill rules. (There are two; even-odd and non-zero, both of which are useful and commonly used.) It seems that Illustrator also has a similar bug.
I have run into the same issue. I’m also an AD user, and it has been working fine for me up until 1-2 weeks ago. All of a sudden, enclosed holes have been solid in the GFUI - but I know they appeared correctly a couple of weeks before.
I haven’t updated Affinity Designer recently (the date on the app is 10/15/17, before I even got my GF), and the same exact process worked for me before, so I believe the change has been in the GFUI.