Hi Chris,
I was able to replicate this issue on my account. It seems that the Hidden: invisible when screen first loads checkbox is not functioning properly at the moment. I'll put a ticket in with the team to fix this. In the meantime there is another way to hide a radio button on screen load that works the same way. When editing the screen, click on the Advanced... button near the top left of the screen beside the screen name. Step two of the screen properties will allow you to set actions that are triggered on screen load. Use the action Show/Hide Field/Object and select the radio button.
- Jason
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Jason Masina
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