This happened to me as well - no EPG data for 7mate or GEM - despite having both channels set for EPG grabbing and mapped to all cards.
I then went into TV Channel Config and deleted channels I didn't need (Nine HD, which was replaced by GEM and 7 HD, which was replaced by 7mate, and a few others). I watched Nine Digital for a few minutes and the GEM EPG data appeared, but not 7mate. I then watched 7 Digital for a few minutes and 7mate EPG data appeared
I'm not entirely sure, but the EPG grabbing may have been getting confused while the old channels (Nine HD and 7 HD) were still active.
MLH01.
I then went into TV Channel Config and deleted channels I didn't need (Nine HD, which was replaced by GEM and 7 HD, which was replaced by 7mate, and a few others). I watched Nine Digital for a few minutes and the GEM EPG data appeared, but not 7mate. I then watched 7 Digital for a few minutes and 7mate EPG data appeared
I'm not entirely sure, but the EPG grabbing may have been getting confused while the old channels (Nine HD and 7 HD) were still active.
MLH01.