There is a thick black line running through my dependent's name, SSN, etc. that doesn't show up in the print preview.
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Be sure you have the latest version of Adobe Reader as well as fully updated TT software (it appears you're using the desktop version).
For various reasons a PDF file can contain damaged content such as images or fonts that The Reader cannot process during printing. Printing a PDF file as an image bypasses that processing by sending the printer a simple image of the document instead.
Sometimes using the “Print as Image” setting in Adobe Reader is the only way to reliably get a print job to succeed.
Choose File > Print, and then click Advanced.
Select Print As Image.[The location of the Print As Image options depends on the version of Reader]
Click OK to close the Advanced Print Setup dialog box, and then click OK to print.
Hopefully that will get you a successfully printed copy of your tax return.