VLAN Issues on a Stacked 3750.

I have 4 Cisco 3750’s that are stacked as one logical switch. I tried to set-up a VLAN for two ports (IPTV Server, Lots of Multicast traffic). I gave them there own subnet and turn on “ip routing” on the switch. From the switch I can ping both VLANs however, I can’t ping from one to the other. I also tried static routes on the switch. Any ideas. Thanks