In our guest bathroom, we have a fan/exhaust combo with 2 switches. Today my wife noticed that the light wouldn't turn on until she turned the fan on. Then she could turn the fan off and the light would stay on.
I did not modify the switches in the bathroom. Right is fixture above sink (working fine). Left and middle are ceiling are ceiling light and exhaust fan respectively. If I turn on the light and it doesn't come on, turning on the fan makes is work. I have noticed that after I did use it for a while it does actually work sometimes independently of the fan.
Fan model is a Nutone 763 I believe:
FWIW - I did just add a "smart switch" to a light that was on the same circuit in the breaker box. It seems like it can't be a coincidence, but the light switch I added and all other lights are working fine.
Foyer / front porch switch which was modified:
The two blacks were connected to the previous switch, the bare ground I connected to the green wired switch, and the neutral I connected to the 3 white wires that were capped together.
For visibility I have moved the middle switch out of the way but it was not modified. Left most is Entryway light, middle is nothing as far as I'm aware, and the right is the Front Porch light I wanted to put the smart switch on.
Thanks for any input.