The issue was discussed in this topic. Maybe will give you some insides of the problem. Also you should update Idepix.OLCI as @marpet said in the post below. Cheers!
Is anyone here successfully running Idepix.olci with S3 scenes?
This may be related to the issue here, where IdePix.olci runs overnight, consumes all the RAM, but doesn’t produce anything: Sentinel 3 IDEPIX mask in snappy
I’m not using python just the SNAP GUI. When I load an S3 scene and run IdePix, it returns results fairly quickly. If I then try to display a cloud mask, nothing happens - the progress bar runs for a few hours before I kill it.
I’m running the latest SNAP as of today (6 Feb …