I have the latest version of Lightburn.
I am using a thunder 24/60 Laser
Connecting via IP.
I am trying to use solid letters instead of outlined.
I am using licida Calligraphy font, but, I have tried arial and times new roman.
When I change the later to fill and try to preview (Play) I get a diagnostic
Saying that the letters are open. I have highlighted the letters and cannot see anything open.
And ideas would be appreciated, thank You.
Upload your .lbrn2 file and also a screenshot of your entire Lightburn screen with layers panel open.
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Check out this link. We solved a similar problem with a specific font.
Another thing to check is if you have duplicated shapes. Delete Duplicates is a command that I run on nearly every design before I try to print.
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From your preview, press continue to the warning.
Compare your preview to your design view.
That will show you where you have a 'open" shape
Your open shape is a stray line hidden in the Instagram QR Code.
When you get the warning, click “show me” and it will highlight the open shape(s), then you can delete or handle however is necessary. Here is the preview after deleting the stray line.
You have a spurious line behind the Instagram QR code. If you delete this it previews without error.
You just beat me to it!! 
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Thank you all very much.
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