Yes, left ALT+1...5 don't work on 0.16.0, they worked on 0.15.0.
Hmm, works on my side. Ok maybe a bug, what keyboard type (QWERTY/AZERTY) and system do you use?
AZERTY, Linux Ubuntu 64bit, TIC 0.16.0 64bit
I added AZERTY support in 0.16.0 and I think it's the reason why ALT+1..5 doesn't work for you.