I have asked on the other thread and it does appear it is not just me. Since the change to 500 threads it is impossible to get on to page 2 unless you have bookmarked a post on page two.
Most of the buttons become unresponsive on a long thread now ie reply, top. I did manage to flip a thread but that doesnt always work. My mobile is a Samsung Galaxy Note using android 4.1.2 jelly bean.
Many Thanks