Thanks for that.
I was moaning that I couldn't choose my seats in SL3 as I logged in early to buy yesterday, ending up with Row 4.
Seems I dodged a bullet.
That explains a lot. I couldn't understand why I couldn't select seats but when I went in again (after I bought the tickets) I could.
At the time, all the seats sold were taken up in the middle of the rows but not near the aisles. Thought that was strange.