Why is the text box showing up when downloading to PDF

Also, if you are viewing the PDF in a browser, the strategies browsers uses for anti-aliasing the flattened boundaries can be different. Here’s Firefox on the left, which shows the stitching, and Chrome on the right:

Hi @Dancedance123 , By text boxes do you mean the thin lines that show around the text in a PDF reader—the stitching Eugene is referring to? If that’s the case they will not show as long as the output is to a high resolution RIP, which Blurb will certainly be using for output.

I can see that you exported to the PDF/X-3 preset with the Output Destination profile set to the default US Web Coated SWOP. The PDF/X-3 Standard forces all transparency to be flattened, and the stitching artifacts are the result of the anti-aliasing used to draw the page on your relatively low resolution display. Check your Acrobat Page Display Rendering Preferences and try unchecking Smooth line art:

Looks like a stitching artefact to me.

Impossible to know how it will print.

It shouldn't print like that - but if it does you can't say you weren't warned.

To me - it looks fine - I don't think it will print like the preview.

The preview is probably not able to parse the transparency effect

But it looks ok to me. But who knows.