When one of the two triggering options is selected in the Advanced Menu of the Recorder tab (see screenshot of the Recorder advanced parameters window), it is no longer possible to deselect both of them at the same time.
This causes the camera to demand an external trigger when the operator wants to record a movie and makes it impossible to do otherwise.
This bug is corrected in Altair version 5.80.019 and later ones.
Please contact your local sales office if you wish to update your software version.