T600WV dimmer fails when a 25 watt bulb in ...

I have had my fair share of this happening. Light dimmers use a solid state semiconductor piece of electronics called a "Triac". The Triac works by switching on and off about 120 times per second so the lightbulbs will be receiving a pulsating voltage. Lowering the knob makes the off time longer so the lights dim. What can happen is the Triac is faily sensitive to current spikes that blowing bulbs can cause the Triac to fail. Triacs often fail closed so that it will not dim the lights any more. The manufacturer can better protect the triac from spikes, but they don't to cut costs. They work most of the time for a while until a blowing bulb takes it out. I am just attributing it to cheapness, and I have had good luck with the box stores and manufacturers giving me a replacement. Please do try and get refund/replacement.

You don't have a ground (bare) wire hooked up at the fixture and it need to be hooked up at the dimmer as well