I am fairly new to LaTeX, TeX etc.(I have the latest MacTeX package) and I just recently tried to print out one of my documents made on TeXworks. It would not send any data to my printer. I copy and pasted all my code into TeXShop and it printed. Why is this?
(CW from comments)
TeXworks is a multiplatform front-end to TeX/LaTeX; its current version is not able to print PDF files on any of the supported platforms.
Whether the situation will change in the future is not known, but the issue doesn't seem to be high priority in the developer's intentions.
Since TeXworks is largely inspired by TeXShop, on Mac OS X it's better to use this one.