I have two files open in different tiles, A on the left, B on the right. I printed out B. Now I want to print out A. I click in file A's window and the filename at the top of the tile turns blue (assuming this means it's active). File->Print brings up the Print dialog. I click Preview, review file A, escape from that, and change the Font size. I Preview again, like the look of file A, then try to print. The printer spits out file B.
I tried this again with a couple of changes:
1) I had some text selected in file A. When I brought up the Print dialog, I unchecked and checked the Selection Only checkbox, then escaped.
2) I did not Preview or change Font.
Now, I correctly print out file A.