If a dyno has just been started/restarted and the very first thing the user does is to click an upvote button, the upvote fails.
Once a document has been added, the upvote works reliably.
If multiple users attempt an upvote initially and keep trying, the upvote eventually starts working (after a couple tries?).
Especially in Internet Explorer, there is a delay before one see the upvote result and it may appear to have failed when it actually worked. If one tails the log, one can see which attempts actually fail.
If a dyno has just been started/restarted and the very first thing the user does is to click an upvote button, the upvote fails.
Once a document has been added, the upvote works reliably.
If multiple users attempt an upvote initially and keep trying, the upvote eventually starts working (after a couple tries?).
Especially in Internet Explorer, there is a delay before one see the upvote result and it may appear to have failed when it actually worked. If one tails the log, one can see which attempts actually fail.