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Late reply but just saw this thread. I believe those are seams. They get printed for roundish type prints and there is a default location that the slicer puts them but most slicers I know allow you to specify where the seam goes so you can put them in unobtrusive locations as needed.

I use the non-commercial version and it has very few limitations (e.g. 10 editable designs open at once) so I would uninstall and reinstall.