Did you check /admin/settings/reputation, maybe the reputation setting is higher than 1 which would prevent new users from uploading profile pictures.
Unsolved How change button color
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color change code when mouse cursor is over button
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@onur-baran for text, background, or both ? And which button ?
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@phenomlab both new topic and reply buttons
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@onur-baran New Topic
#new_topic { background: #000000; }
Reply button (note that this shares a common class, so may also impact other buttons)
.btn-primary { background: #000000; border-color: #666666; }
Obviously, replace the # values with the ones you actually want.
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@phenomlab ty