Instructions say this switch works with fluorescent fixtures, but I've wired it per instructions and light does not come on. This is a shop-light type fixture that plugs into an outlet (i.e. not hard-wired directly from a junction box). If I turn the switch on, unplug the fixture and then plug it back in, the light comes on (and switch can then turn it off). But with the fixture already plugged in, turning the switch on does not turn the light on. If I plug in a regular light (incandescent), the switch works fine -- turns light on and off.Is this a ballast issue, or something else I'm missing? I believe the fixture has an electronic ballast.thanks