I'm a little confused. Why can't you clear the CM11A (unplug, remove batteries, disconnect serial connection, wait 30 seconds then reconnect) then reload your saved program. That does not work?
FWIW: The new X10.com (totally new owners) is again selling the CM15A and it appears they have improved the old CM15A RF performance, although that won't effect you since you were using the CM11A.
http://www.x10.com/x10-pro/interfaces.html The old Active Home Pro software died on the old X10.com servers, but is available from other locations. This forum and the Tuicemen forum
http://tuicemen.com/forum/index.php has more information on how to get a working copy of the Active Home Pro version. There is a number of third party programs which can use the CM15A as an interface, but I believe they all require the computer 24/7, the CM15A only acts as the powerline interface on the third party programs..