Error Message when adding a Collection while Posting Product

[Cat]

The past day or two I've been getting an error message when trying to add a collection while posting a new product. I don't think it happens every time, but it's happened at least twice. The message tells me that the collection is in a different store - but I only have one store! 

If I post the product without choosing a collection it works fine, and I'm then able to add the product to the collection after it's been posted.

Links to the product and collection:
Merry Christmas Rustic Winter Pine Trees Holiday Doormat | Zazzle
Three Watercolor Pine Trees Rustic Christmas Suite (zazzle.com)

[Cat]

Just clarifying because I think my wording may have been confusing. I wasn't adding a new collection - I was trying to add a product to an existing collection.

[Connie]

Yes, I'm having this same issue!

[Anne]

I don't get an error message, but the page just freezes. I thought this was fixed? Anyone else seeing this?

[Cat]

Still seeing it on occasion. It's not a huge problem for me, just annoying when it happens.