Master cue stack wont run

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The lighting designer on our next production  has found that whilst he can programme cues into the master playback when he tries to play the stack it will not move beyond the first cue. It is possible to select another cue in the stack, take the master fader down and then up and that cue is selected. In practice not a viable way to run a production. Use of the space bar on the keyboard doesn't work either.

All was fine on the last production but something has changed.

We can still programme a stack on any of the other sub-masters and these seem to run as they should.

Any suggestions on what could be causing this problem with the master playback?

[scottydog75]

As a first check, hold SETUP and press the playback GO button. Make sure that the settings are like this:

[alg]

Thanks I will get this checked.