The thing is, when we had first started testing the DPSK feature, we used the default 62 character passphrase for some of our initial mobile devices, but we then changed it to 12 characters to make it easier to copy and paste for devices that required manual PSK entry. When we made the change back then, I do not recall that this erased all the previously generated 62 character PSKs.
What bothers me is that this is not documented at all in the User Guide, nor is there any warning or indication in the WLAN setting screen when the number of characters for the DPSK passphrase is changed. Is this supposed to be expected behavior? If so, why is there no warning whatsoever in light of the catastrophic consequences that this simple change can cause?