RND4250

I have the Netgear RND4250 and at one time I was able to access photos stored on this device from my Moxi (DVR Network Connected Device). I can no longer access the device and therefore the photos store therein. I contacted Moxi and they stated that the RND4250 is not listed as a certified DLNA device as shown on (http://www.dlna.org). If this is the case, then;
1) why could I access the device at one time but cannot now and
2) is there any way around this?

I admit, my knowledge about all of this is VERY limited so keep that in mind when responding.

One last bit of information that may be helpful (or may not). The desktop computer connected to the network and running the software for the NAS is running WIn 7.

Any assistance is appreciated.