I've upgraded to 5.01.10 on my 50LB470V and there is noticeable improvement in overall performance. I didn't have too much time to test it yesterday but I've noticed one new problem and one I had on all previous versions.
New one is subtitles not displaying on DVB-C channels. When I tune to a channel with subtitles there is an icon in channel info informing that subtitles are available and an option in Advanced setup menu to select it but nothing happens when I do it. After entering subtitle menu again it is resets to None again. I guess user "tehnicki" is having same 250 DVB-C channels as me (b-net? ) so some input would be appreciated.
Second problem (which was also present in FW 04.xx.xx) is Time setting. When set to Automatic TV detects my Time zone and location correctly but time is 1h behind. If I put it on Manual I can set the correct time but then EPG is wrong showing shows 1h ahead. I did find a workaround tho. I set it on manual, choose custom Zone, set GMT+1, and then click on Automatic. For some reason everything is correct then.
Anyway, 05 beta is definitely an improvement over any 04 FW, it just need some testing and polishing.