If you are using Adobe X, the Adobe toolbar may seem to be missing from the screen when you try to print.  

This is what it may look like:

To see the toolbar:
  1. Open an invoice, then click Print.
  2. Hover your mouse toward the bottom center of the preview window.
  3. You should see a grey, floating toolbar display.
  4. Click the Print icon.

Gray toolbar

If you still can't find the toolbar and print:
  1. Open Adobe Reader.
  2. Choose Edit > Preferences.
  3. On the left under Categories, select Internet.
  4. Select the Display PDF in browser checkbox.
  5. Click OK.
  6. Close Adobe Reader.
  7. Try printing your document again.
Your document should print in a separate window and the toolbar should display.