Cambidge 302 display polarization

Hi folks,
This weekend I flew a task with a borrowed 302.We are planning to
upgrade the panel and it was a good oportunity to try it out. It was
the first time I used one and I liked it but the display blacks out
with my polarized sunglasses and the only way to read it was lifting
them or tilting my head..
Is there a fix for this? Someone told me that newer units don´t have
this problem.
I prefer flying with polarized sunglasses so this would make me vote
against buying one in spite of it being a very nice instrument.
Thanks!
Juan Carlos