Lorex says I can only use there POE switch

[moose66 0]

I have a lorex NVR system. If I plug the cameras into the NVR directly all is good. But if I plug the cameras into the switch cameras do not show up on the monitor. If I go into camera registration on my system the cameras(4) all show up as showing they are live Status is good etc. but nothing on the monitor. So I know the switch is patching each individual camera through. Lorex tech support says that I have to use one of there switches otherwise they cant help. I find it hard to believe that you can only use a lorex POE switch and make it work.. I am using a mokerlink POE-F042F poe switch with a Lorex N843A8 NVR. I am not trying to run this through my router but as a stand alone system. I did set it up through the router to see if it made a diffreence but no luck. I hope someone can pleas help me with this issue. I really cant afford to spend $300 on a switch.