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Did you recently upgrade the software to android 4.4.2? If so, that is the reason for the changes. It happened on my S4.
Good grief - what is the point of that change? At least the arrows gave me a clue if something was happening on the wifi or if the phone was just stuck.You'll notice that the little up/down arrows on the data and wifi icons are gone too.

All system notification icons in the status bar are white with KitKat (v4.4.x). You'll notice that the little up/down arrows on the data and wifi icons are gone too.
That's a personal decision. On the one hand, it fixes the 4.3 bug in Developer Options where "Transition animation scale" got reset to 1.0 every time you accessed the camera app. But as Allan pointed out above, having the upload/download indications gone is less than useful. You can still see them in "Quick Settings" (accessed by swiping down on the right side of the Notification bar), but it's less convenient.is it better to get the 4.4.x version than the older one?
