Losing audio on tracks even though they are still there

I just managed to get some semblance of a song going with three tracks and then the drum track would not play anymore for no reason. If I try to add a new drum track it wont work either and then it stops playing another track so of the three tracks I am only left with one track. Seems very strange - is this a bug? Any help appreciated.

Hi,

The Monitor button is enabled on the track. Therefore you can’t hear the recorded signal. Disable the Monitor on the given Audio track, please.

Thanks so much for helping! That has solved it.