Argggh.
I’ll PM you my email address and I can post it on your behalf.
Or you can share a link from Dropbox. It’ll let you post links right?
At my current status, no. I’ll be happy to email it to you, thank you.
There is a known issue with interpretation of winding order on some Corel Draw exported SVG files. You can temporarily get around it be saving the affected files as PDF and the interface should interpret them correctly. 
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It might be moot now that @jules as provided the work around, but here’s the file that @MichaelKoske wanted to post, but couldn’t
TMNT-coaster.zip (27.4 KB)
Y’all go ahead and play with it and see if you can come up with some other answer…I’m computer crippled for a while. It might not be that and I can’t test it. 
I’ll give that a shot now, thanks.
If you want to dive down the nitty gritty details of the winding issue you can check out this thread:
I’m a Coreler myself 
Check to see if it’s really not filled by drawing a big box colored blue or something. Send it to the back. If you don’t see blue than that section is not transparent (null-filled).
I did a video walkthrough of how to create islands using Corel (and did run into the winding order problem with one of the objects). I did it for @davidgal2 using his design so I’d need his okay to link to it on Youtube.
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Hehe, that’s exactly what I normally do. 
I actually found a fix. It adds one more step, but it’s worth it to save the hassle.
I just saved the Corel file, then opened it in Inkscape, saved it from there as a .svg, and BINGO! It works!
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Not just Corel. I’ve run into this with Affinity Designer, too.
Mixing the even-odd and non-zero winding rules in the same file sometimes results in weird results on the GF.
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Didn’t realize…did you file a ticket with support when it happened so they could add it to the list?
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Probably the winding order issue. That one is usually fixed by opening in Inkscape and resaving. I don’t like having to do that though 
And there are some folks who aren’t able to navigate Inkscape easily so it doesn’t necessarily help them.
The reverse path command in Corel doesn’t seem to change the winding order so that doesn’t help either. I keep looking for the solution.
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If you reverse a closed path it must change it’s winding order. The direction of the path (clockwise / anticlockwise) is its winding order.
The kicker, I think is not to reverse them all (which somebody said they did) because I don’t think that helps. You want to have them alternating for completely nested paths to have the winding rule give the same result in both cases. IIRC. I admit, I didn’t think it through carefully. 
You need islands in one direction and holes in the other, regardless of nesting.
Yeah, that makes sense. And then the thing to watch out for if you’re working around software that applies the same rule to everything regardless is paths that cross themselves. Simple crossings work, but more complicated examples it doesn’t matter which direction the path goes, the two rules give different results.
I think if you use fillrule:evenodd and make all islands one way and holes the other (I can’t remember which is which) then it works even when things overlap. For example two overlapping holes make a hole that is the union of the two. Same with overlapping islands.
When you use the default fillrule:nonzero you get the symmetric difference when you overlap shapes. That isn’t useful when cutting out physical objects. It does give nice 2D patterns when printing.
I was once got roped into demonstrating 3D printing at a Mini Makerfair in Manchester. The guy organising the stand gave me some STL files to print. His came out correct but mine had big holes in them. The reason was he had overlapping meshes in his STL that should have been unioned and he used a slicer that applied fillrule:evenodd to the 2D slices and I use one that uses nonzero.
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For Corel I had a design I was helping someone with. A half-dozen objects one of which wouldn’t translate correctly as an island in the GFUI.
If I opened the SVG in Inkscape and saved it, it worked.
I checked the SVG file from Corel and found the winding order problem and it was not in the SVG saved from the Inkscape file.
I did a reverse path operation in Corel, verified from the indicators on the path that it now matched the other objects. Saved it as an SVG and it still had the problem.
So I know it shouldn’t but it does. It just only happens maybe 1% of the time so I don’t sweat it. I can see when it happens by looking at the thumbnail in the GFUI so I don’t even waste any materials.
The path direction difference was caused by the object being a mirror of another object. But that doesn’t always result in the issue in the SVG because I routinely mirror & flip objects to simplify things like my flat pack reindeer.
Thanks everyone for all of the help. Since you were able to find a fix, I’m going to close this thread - if the problem reoccurs, go ahead and post a new topic.