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I don't know if it got mentioned already here, however, some may find this information useful:
Most Smartphones and the eReader, too, have two charge modes, slow and fast.
Connected to the PC or any other normal USB connection the device gets charged slow, because the current is limited to max. 500mA, that's the USB specifications.
To enable the fast charging mode, AC adapters that support it (they must deliver at least 1000mA (1A) output current) have the two USB data pins shortened. This way the device knows that it got connected to an AC adapter. That's why almost all smartphone chargers charge the eReader in fast mode, they use the same 'technology'. And because the eReader knows that it isn't connected to a PC but an AC adapter you can continue reading on it.
If you connect the eReader to a USB HUB which isn't connected to a PC, the data pins are naturally not shortened, so the eReader thinks it got connected to a PC, uses the slow charging mode and tries to connect to the PC displaying the odd looking screen.
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