Repro Steps
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Open the front page (alpha.glitch.com) in Safari.
Click on avatar
Expected Behavior
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I can see a bunch of choices for things to customize and can see what my new avatar will look like before pressing "save and close"
Actual Behavior
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I see a bunch of buttons on the bottom of the popup and nothing else.
I can select options by blind clicking.
Changes do indeed save.
PS - I have been meaning to report this for a while, but figured it was just a temporary problem with the new avatar system and my computer. But with new tests seeming imminent, I figured it was better to get around to filing the report. Also, it works fine in firefox.