Scrubbing tracks in Naim app in iOS9

I posted somewhere else recently to say that for some reason I can't scrub tracks along (i.e., push the slider further into a track) using the Naim app - from Asset on my uPnP.

I think I just experienced the same thing on an unrelated piece of media on my phone, so I was wondering if it was an iOS9 thing, and if anyone else has noticed the same thing?