Previewing an Invoice in Studiometry and then printing or saving directly to a PDF may cause some visual issues due to the Apple WebKit rendering.
To get around this, select Generate To File, open the File in Safari, choose Print, and under the "Safari" options check Print Backgrounds.
Will there be a better solution to this issue in version 10?
Is this issue solved in 11.x ?
Studiometry still uses the Apple WebKit for both display and printing of the HTML templates. The same solution still stands where you select Generate to File to preview in your browser and then print from there.
Separately, if you use Visual Invoice/Report templates, you'll have more control over the layout and the printing/exporting will work more smoothly.