I haven't had problems with YouTube on mine, either. This might be a bit late, but some versions of the YouTube app from the Play Store can be buggy, as can those for Facebook. If that's the case after an update, the browser might be worth a try.
Incidentally, my Ion had a Sony Ericsson branded charger. Also, when I look at photo details through the standard gallery app, that says it was taken with a Sony Ericsson. The old name still lingers a bit...