I had given it up as useless after it quit so many times on launch, but after a day of two it began to function normally again without my having done anything...and it has given me no serious trouble since then until tonight...
Well, lo and behold - today, just for grins I tried the 6s plus over my cellular connection while at the mall (no WiFi), and the TCM app worked.
I have to say though, those "snappy" improvements to iOS didn't help the TCM app at all... there's a bit of jittering when an image is panning... but the audio sync does seem better than before.
Some other things I'm noticing -
- as long as the TCM app is actually playing, I no longer need to set the iPhone 6's "autolock" time to "Never". (Something my iPad still requires)
- it may be my imagination, but the iPhone 6s plus may not be running as "hot" while playing via TCM as it once was.
Remember, I didn't have 2.16 up to now, so I can't attribute these differences to iOS or the App. If I get brave, I may try restoring the older app at some point to check if it's better. As of now - I'm inclined to leave well enough alone.
FTI - I don't just watch films "On the Phone" but feed them to an AppleTV connected to my 55" TV. This increases the phone's processor load because it uses Airplay in "mirror" mode to transfer the picture. (Did it always require that? I think I recall an earlier version that rendered on the AppleTV directly... but that may have been the VLC app, not TCM)
Pressing my luck a little - I checked the 5c (loaded with v2.11 of the TCM app) - it "works" now too. It still has a hiccup - and kicks out to the home screen unpredictably, but at least it doesn't crash-on-launch as before.
Anyway, I hope telling of this tale, and all our experiences helps someone else out in the future.
Thanks all! I will definitely post again if it dies!
Now if only my older BBC News app would begin to behave! Grrr...