Okay - I've made some progress. The issue appears to be with the Altair driver - 1080p images are never successfully transferred to the client. Running the autofocus system seems to reset the setting in INDI to 1920x1080, regardless of its previous value. This then caused all other image modes to fail, but changing the setting back in the control panel restored full functionality.
Once I managed to make the focus module run at 800x600 - and the expected behaviour occurred, asking me to select a star. However I have not yet reproduced this result.
So I guess the issue is now clearly not with the focus module and instead with the CCD system. I am wondering if there is some way to specify the resolution explicitly for the autofocus procedure as a temporary workaround?

Thanks again for your time.

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