Tempo stuck on 126 for all projects in ios8.1

Today I tried to use SP to play an accompaniment for me, but the tempo was showing at 126 in the metronome menu, so I tried to slow the piece down. I could change the number from 126 to anything that I wanted, but the playback speed did not change at all.

When I went back into the metronome window, 126 was showing again.
When I opened some of the default projects (eg BlueSkyBoogie), it showed 126 too.
I could not change the playback speed for that project either.

I'm running the latest SP on an Ipad Mini, iOS 8.1 (12B410).

Is this a known bug (maybe it came in with ios8?), or can I do something here to fix it?

Thanks