the problem with the back button at IP-EPG still persists at my 7605h/12 @ 140.047:
1.) start IP EPG
2.) after everything is up: press ok
3.) the description of the currently running tv broadcast is displayed
4.) hit the back button
5.) Instead of navigate back to the channel list, IP-EPG is closed.
at my side this problem persists since July 2012 - it seems that Philips is not able to correct this; really bumbling.