No Sound on playback or output

Using Qubase 6, M-track Plus into an i5 computer to record services.
Installed driver for M-Track and all was fine. playback was good. Exported to Wave and opened and play.
Today no sound on playback, looked ok exporting, but open in iTunes and nothing there. opened in sound Booth and nothing there.
Settings show f4> Output: M-Track Quad ASIO driver, left and right tracks show Analog Output 1&2
Input: M-Track Quad ASIO driver, left and right tracks show Analog Output 1&2
Mono In1-MOno In2 both: M-Track Quad ASIO driver, left and right tracks show Analog Output 1&2
VTS Link, System link -connections: Analog Input 2 ASIO Input Analog output 2 ASIO Input
VTS Audio system: M_Track Quad ASIO Driver (release driver when App is in the background)
Audio priority: Normal
Tried with Record Enable both on and off
Tried with Monitor button both on and off.
The waveform is there and editable, even when I open it anew, but there is no output sound, and when saved as Wave file to iTunes, no sound, open in Sound Board and no sound or even a waveform.
Tried saving as an MPEG1 but same results…
This happened all of a sudden to the old computer, and now Is happening again to this new machine.
Help!