It happened to me, I got a debug log, and I figured it out, I believe. This (or the equivalent) will happen for any item which:
- we have to make one at a time (sugar, pixels, star charts, chefstaves, etc.)
- we've made one already this session - which sets the password hash in the cached request
- we've timed out and back in - which changes the password hash
Trying to make another of the same item will submit the request with the old password hash - which will, generally, just refresh the item creation page with no item made. For sugar, if we get no result, we say "you can't fold that."
Revision 8536