X10 has this on the board of things to fix;
I was expecting it to be fixed on the last
release, but no luck.
Here's the work-around --
In ActiveHomePro, define the module TWICE -
Once as a standard wall switch,
and once as an appliance module.
Use the appliance module to turn it on/off,
and the wall switch to control dim levels.
I know it is a hack/kludge, but it's the
best way, until X10 fixes the problem.
T