PWM channels 3/9 "interferance"

Using Arduino Project Guidance
1

I have a project with two PWM channels. Every time I set one of the channels the other goes dead. If I do analogWrite again on the dead channel it comes back. Is there any possibility of something going on in the background? Is there anything to be aware of?

2

You might want to post your code inside code tags please ( </> )

Or read the sticky posts at the top of the forum first might be a better idea.

Bob.