Polarized glasses do not work well with 737 NG LCD displays. If you turn your head slightly, these displays will appear dimmed; if you turn your head further towards the pedestal they may appear entirely black like the window for your squawk code. You can witness the same phenomenon at home by looking at an LCD computer monitor, laptop, PDA, or the display of your mobile telephone: turn the telephone in front of a pair of polarized glasses (or your head in front of the display) to see what can happen.
I have switched to non-polarized glasses since I started flying the 737 NG.