In Survival or Creative mode, with a resource pack, the cursor is a square, as if it were being drawn using a corrupted image file. When I press F3 to display information, the cursor changes to the Spectator Mode XYZ cursor. The only way to get the normal crosshair cursor seems to be to turn off resource packs.
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Looks like a regression of MC-56884

In response to Blah's comment, i've tested inventory contents. I did not test every possible item, but I have tested with more than one item from each tab of the Creative inventory. It appears that if I have anything at all in my inventory, even just one item, the cursor malfunctions.
To reiterate, this failure does not appear if I do not have any resource pack enabled.