Is it possible that the firmware update to firmware 1.06 for the DCS-5300 was mistakenly made available to the DCS-6600 owners on the D-Link website? Thanks again for your help.
No, the firmware available is the 6620 firmware. On top of that, even if the DCS-5300 firmware made it onto the website, you would not be able to load it onto the 6620 and would receive and invalid file error. There are checksums in place to make sure things like that can't happen.
Which version of D-ViewCam are you using?