Are you sure you are doing a full satellite scan and not just one transponder?
Here are my settings:
Manual Scan
Tuner: Tuner A: BCM7346 (internal) (DVB-S2)
Type of Scan: Single Satellite
Satellite: 28.2E Astra 2E/2F/2G
Network Scan: yes
Clear before scan: yes
Only free scan: yes
Does this answer your question, I am a little unsure?
If you are using the old type lnb They will work with skybox and frees at boxes but for some reason don't work well with the Zgemma if it's not old type try a different port on lnb
My box only has 1 lnb port?
Thanks.