Yeah, it's buggy. If you use the Lover's Stone, you will never get it (until you switch stones), but sometimes you don't get it anyway. Usually I've fixed it by moving the spouse to another location (their house if they're currently in one of yours, or vice-versa), sleeping there, then moving them back.
Never used any stone but the 3 class ones, actually

but oh well, I guess it's only a small drop in the ocean. I barely even noticed I was missing it, just a shame that I only made it to 86 enchanting with the mass ammounts of soul gems I had stacked up, Maybe with the extra 5% exp I would of been close enough to bother enchanting
