Hey ,
The bug report that was entered pertaining to this issue UE-11730 is still in testing. Since this feature was introduced with the initial release of 4.7, it is still in its experimental stages. If you would like some more documentation on the framework of HTML 5, take a look over our documentation. This is also limited at the moment, but will become more complete as we continue to expand and improve upon the feature.
HTML 5 Documentation
If you are able to get your reflections to work properly within the 64 bit version, I would use this as a workaround until we are able to provide more support for 32 bit. We appreciate your patience while we work to resolve this issue. Let us know if you have any other questions.
Regards,