Logo is not showing on printed invoice

In the newest version, I edited logo via business logo. This logo is shown on the sales invoice on the screen, but not on the invoice in PDF.
The logo is png file, the themes used is Smooth Blue.
How can I do to make sure the logo is shown on the PDF invoice?

What actual version number? (Manager advances very rapidly, sometimes several versions in a day.) Also, be sure the graphic file size is less than 250KB.