I’ve had this one twice today.
After recording a sound via the input monitor and Sample section, once the sound has been saved to a pad, the input monitor no longer works. It’s switched on but no sound is coming out. if save and re-start the project, switch in input monitor, it. works again.
Are you getting the sound over headphones instead? This might be related to similar issues I have with sound not playing as expected after leaving sample mode.
I have reported this as an issue too. Someone else reported similar behavior.
Cannot reproduce this. Can you give more detailed steps?