Until today ar there have been zero problems with LE and I have succeeded in getting an A+ rating from SSL Labs. Today, however, I tested an LE site with a Lumia 520 test phone and IE tells me that the certificate I have installed does not come from a trusted party. The same site works fine in any other browser environment, including IE11 in Win7.
So it seems to me that the LE is not on the list of trusted parties in the Win 8.1 phone. Anybody else with Windows Phone 8.1 out there?