Hello, I'm another user that needs improvement in the YouTube app for Philips SmartTV.
I'm using 42PFL6008 which has hardware QWERTY keyboard on the remote control and it's not possible to use it in the application. Another issue is with YouTube 3D videos which once played corrupt the application to a level that the TV should be restarted. The speed of initial start of playing videos is very sluggish and it's not because of network issues.
Please consider reworking the application or provide some procedure for downgrade the version of the application as it seems older versions worked more fluently and without the aforementioned bugs.