I'm using the default configs and version 1.8.1.1 of Random Portals.

When right clicking a nether portal block with a vanilla dye, the color of the portal changes as expected. When using a modded dye, this doesn't work.

For example, Thermal Foundation's blue pigment does not work. Adding ore dictionary support would fix this.

I'll put this in the next release when I get around to it.