The WS467 is a two wire dimmer. Made for incandescent bulbs. So it can steal power through the load.
Are the LED bulbs rated to be used on a dimmer switch? If not that is an issue.
Even if rated for use on a dimmer. I found in my tests. Most dimmable LED bulbs did strange things on a WS467.
Does the local push button on the WS467 work?
You may want to test the WS467 by temporarily using incandescent bulbs on it and see if anything changed.
The WS14 and WS469 are relay type switched made for things like a LED load. Though you need a Neutral power connection for them to work.
It could also be a signal problem to the switch. Do you have any phase coupling between the two incoming power lines?
You may want to unplug some electronics and see if anything changes.
Is the CM15A on the same circuit as the computing equipment? Many times that effects the X10 signals if the equipment is not on a X10 filter.
Jeff has a great set of tutorials you may want to look at.
http://jvde.us/x10_troubleshooting.htm