Ugh. That definitely sounds like a printer driver issue. Can yoiu update the driver?
One other thought. Since the pix are coming out okay, select the textbox and Ctr+X to cut it.
Paste Special as PNG. Ctrl+Alt+V is a shortcut for Paste Special if you want to use that (otherwise it's the bottom half of the Paste button on the Home tab) -- then choose PNG. Hopefully that will let the slide print appropriately.
Of course, do this on a copy of the slide, especially if there's a chance you'll need to edit the textbox!