Comment 2 for bug 779564

The xid is allways different. Sometimes there is more than one such rule added simultaneously, only with different xid.
I don't use the opacify option - it's disabled.
This behavior happens sometimes when I accidentally click or drag or mouse scroll over the DBX buttons/previews (or something like that, I couldn't reproduce it manually).
It happens relatively rare, but the bug is still present. I will post ~/.dockbarx/log/dockbarx.log when it happens again.