If you changed just the ip address in the portforwarding rules, then we can rule out the ports.  It has to be something from the device the ports are forwarded to.  Is it a protocol that has to be enabled on the device, like rdp or something like that or just a port needing forwarded?  I would try disabling the IPS since that is the only other thing you did and see if that helps.  Finally as a test to verify that the router is not messing up the port forwarding.  Go to the other devices that was working and change the ip address to the new ip address you are using and see if that works.  If it works then the router is not blocking the forwarding. Another thing to do is make sure you don't have an ip conflict on the network with that Ip address. Give that a try and see what you come up with.