I haven't tried the Variable Data yet, but I know RL7 has lots of glitches!
I tried printing posters from a 14 page PDF, and I couldn't get RL7 to lay them out the way I wanted to save the most material, so I erased the PDF, separated it into individual files and reloaded. I manage to get those posters printed, but it wouldn't allow me to rotate them. I don't know what happened, but somewhere in all that RL7 glitched out and anything I tried to print after that would print as a squished image, and wouldn't allow me to rotate, 8.5 x 11's would squish to 3.5 x 11". Everything looked normal in RL7, but the print would come out squished. Reinstalling RL7 was the only way to fix it, and I won't attempt to print multipage PDFs again.