I think I found the problem with the syrup? The fruit juice portions seem to be what cook down into the syrup, but I cannot make them in any cauldron size or saucepan. The juice just sits there and looks at me, even though there's a lit fire and everything. (I CAN make syrup from "vanilla" fruits and berries, however, so it's just a Wildcraft fruit/berry issue.)
The textures of all the syrup content for the Wildcraft fruits also seem to be broken, considering that they're all white with odd red flecking.
It seems that I also cannot make wines from the fruit juices from Wildcraft fruits and berries. My bottle racks had plenty of wine from the "vanilla" fruits in the game, but my raspberry juice, gooseberry juice, snowberry juice and other Wildcraft fruits remained as juice.
Another thing I noted is that I cannot make chopped King Bolete, Field Mushroom, or Fly Agaric.
Sorry if I'm being annoying, I just thought I should let you know that there could be a bug or two running afoot. Either that, or I'm somehow missing something entirely.