Fletching bug or am I doing something wrong

[Bardolap]

I'm trying to make arrows by combining:
-- Field Point Arrowheads
-- Small Groove Nocks
-- Several Parabolic Cut Fletchings
-- Set of Bone Arrow Vanes
in a Fletching Kit
and getting the message:
-- "You cannot combine these items in this container type!"

I tried replacing the bone vanes with the same wooden vanes that I'd been using the make class 1 arrows, but even that gives the same response.

I noticed several forum posts from back in August regarding tradeskill combines not working. However, tailoring, brewing and blacksmithing are all still working (in the same zone - Greater Faydark)

Help - I'm almost out of arrows! :-/