I have the same issue with the 5222L.  I have 5 D-Link cameras on my network which display as follows when viewed remotely.
942L     480p
942L     480p
2332L     480p
5020L     480p
5222L  240p
The 2332L defaults to 480p but allows me to change to 240p or HD
The 5222L offers no alternative but 240p
I have done a factory reset and re-installed using the latest wizard.  I updated the firmware to the latest version.  So far, this camera has been a real disappointment.