Since I am the only one having problems with Alexa, I guess this is a user error.
With the Dev channel, I was using "Turn On Family Room Light" and "Turn Off Family Room Light" without any problems. However, after removing that and connecting the new Almond Smart Home Skill, Alexa says that the Turn Off command is not supported by this device.
The only way I can turn on and Off the Dimmer switch is by saying "Alexa Dim Family Room Light to 50%" . Earlier, this command used to work in addition to "Turn on" and "Turn Off" . Why was this removed ?
FWIW, the device here is a Linear WD500Z dimmer switch. I have not changed anything except removing the Dev channel. At this point, I am unable to get the Dev channel connected back again.