I'm also experiencing this problem and am very disappointed.
Did you read the post just above yours? this problem is very common - most likely you installed the wrong firmware (UM2 for a UM2+ or the other way around or you modified your feeder for example by installing a bondtech feeder).
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Labern 775
All version of cura should have both UM2 and UM2+ firmware. You can manually select the one you want to install by selecting install custom firmware. In the (cura version)/resources/firmware folder you can find UM2 and UM2+ firmware
But you should have a look at Tinkerware. Its a great addition to your UM2 and you can even change the direction of the feeder in the menu. you can find it Here
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