There are a number of inconsistencies in radio EPG compared to TV EPG.

1. You cannot start playing an in-progress recording from the radio EPG.

2. You cannot set notifications from the radio EPG.

3. Red highlighting on recordings is only shown when in pre/post record time, but not when the actual program is on (although at this time the program changes to red when you focus on it with remote). After recording has finished, program is still highlighted in red.

http://forum.team-mediaportal.com/mediaportal-releases-315/radio-epg-hopelessly-out-date-compared-tv-epg-92911/