Audio tracks acting strangely

[pianoman88]

I'm using Logic X 10.0.7

Today I created 8 auto tracks at cone and copied audio files.
When i mute the first track I'm unable to play any other track.
If I try to solo any track other than the first, I don't hear anything (but signal appears in the meters).
This has happened before.
A known bug?

 

[accentaudio]

Check that your audio interface is online and that the drivers are selected.