This was a very weird one, and the solution was to disable the Acronis Nonstop Backup Service.
Symptoms : Sony Vaio Z laptop, Windows 7 Ultimate, built-in SD card reader completely stopped recognising SD cards. Made no sense why, but I got around it by using the SD card reader in another machine.
Eventually got frustrated enough with the problem that I spent more time Google-ing, and lo-and-behold, Acronis True Image was the problem. I didn't have to uninstall it - just going in to Local Services and stopping and disabling the Acronis Nonstop Backup Service did the trick. The next SD card I inserted worked perfectly.
Note - in the post I linked to above, people talk about needing to reboot after disabling the Acronis Nonstop Backup Service. This indicates that they changed the startup type to "disabled" without stopping the currently-running copy of the service. i.e. make sure you STOP the service AND disable it from starting again in future. Or if you just disable it without stopping it, then you will need to reboot for the change to take effect.
Many thanks to the folks in the above-linked forum page for providing such a simple yet inobvious solution to such an annoying problem!
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