I've been working on approving a few captured horses, and when I click on Submit, it just goes back to the opening screen -- the horse and rating, plus the options to geld or release, never show up.

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This sounds like problems due to a very laggy, bad internet connection on your side and / or multiple refreshing the page you are on while it is still loading.

Please do not spam the bug section with one post on each of these trobles, but make a cummulative one - especially when it is obviousely a user-device problem.