XPP and IE 11

We have an issue where Internet Explorer 11 will not print when XPP is installed. We cannot print to a networked printer or PDF.  This is true for either 8.4 or 9.1. If we uninstall XPP and leave all else the same, IE11 will print. Re-install XPP, no printing.

Does anyone else experience this?

Also, if anyone knows how to fix without downgrading to IE8, which seems to be the only IE version that allows printing, that would be great.

:)