Even though I’m using mControl for home automation I re-installed ActiveHome Pro to tinker with accessing particular modules that are not yet supported by mControl. What I did not know was that during the re-install the X10 software updated the CM15A interface and changed the monitored house code. This effectively disabled all remotes in the house.
After figuring out the problem I tried to update the hardware interface but ActiveHome Pro kept crashing. I updated the software to the latest version, which added Windows 7 support. At that point I was then able to set the CM15A back to the previous configuration.