Note: This can only be reproduced on production, and only if the temporary Systems fixed is removed.
Create a gift exchange
Have five people sign up for the exchange
Wait for a Sign-up Summary to appear
The summary page says "The summary is being generated. Please try again in a few minutes." A summary may appear infrequently.
The summary should always display.
Anything that writes to a file and tries to share it will not work properly. We should move that shared state somewhere else, e.g. Memcached or Redis.