I’m gonna necrothread a bit here… .actually I dont know if this counts as necrothreading since technically I’m just linking to an older thread, but I just want to use the term “necrothread”… and given the content of the linked thread, I think it fits well 
Anyway this thread talks about the issues with CorelDRAW and the GFUI, particularly fills/islands (engraves) not appearing correctly within the GFUI. I’ll link directly to a post with the two ways that SVG files can be rendered as it seems the GFUI does not play nice with one of them.