It’s an old Collection of Christmas Holiday Postcards I established last fall that I was trying to share for promotion now and I abruptly discovered it’s marked “private” for no plausible reason I can find.
(I examined EVERY setting and nope, not me) https://www.zazzle.com/collections/christmas_new_years_postcards-119620270257458679?rf=238308729910790362
It’s NOT a new collection & it’s got like 20 holiday post-cards in it from last season. I don’t even know how long it’s been in this “Private” state. (I’m pretty sure it was public last Christmas) Certainly not from anything I have control of.
It gave me that window message asking me if I wanted to make it “public” so all could view it and I clicked “yes.” It’s noted as “reset 2 Oct” so I hope the next indexing sweep recognizes this. (I tried emptying the cache thing, but it was still showing as Private even after that. 
)
I may be back if the indexing doesn’t correct the matter.