I'm playing FTB: Revelations' latest beta release.

As stated, all glass items (stained/drinking) will not craft.

It won't accept a wax mold, regardless of power, regardless of JEI auto-place it will not warm and melt down components.

However, it will craft everything else associated with the machine.

Is there a reason it won't accept a wax mold?
Is the wax mold what defines a working recipe?
Is there a non-creative workaround or config adjustment that can make it work?

Seems like the same issue as #2304. There was a similar issue linked in that ticket (AllTheMods/ATM-3#752) so I would guess there is a mod conflict somewhere.