Two wifi's, players can see LMS only on one

Several years ago my Xfinity cable modem was replaced with one that has wifi. I kept my original wifi, as they broaden my access area. I can connect my players to the original wifi and can play music from my LMS, but cannot access the server from the cable modem wifi.

Here is my setup: My cable modem with wifi is on the second floor in my den, with a router attached directly. My pc, Mac and printer are attached to this. I have an ethernet cable run from the router to the basement, attached to an ethernet switch. The NAS running LMS is attached to this switch, as well as my original wifi access point.

I'm replacing a squeezebox that recently died with a piCoreplayer device. While setting up the device, I attached it directly to the router. I could see the LMS and play music. Then I set a connection to the cable modem wifi, detached it from the router and rebooted. It was unable to connect to the LMS while connected only to wifi. My connected devices on the cable modem have IP's in the range of 10.0.0.x, while those on the router and switch are 192.168.0.x.

I have tried port forwarding 9000 and 3483 on the router to 10.0.0.x, but does not appear to help.

I would welcome any suggestions and can provide additional detail if needed.