Do those ndless versions break compatibility, then? That seems a bit unlikely to me...
I can't even tell entirely, the native C Tetris crashes on exit on 2.0-OS1.7 and crashes on selection in 1.7-OS1.7, and NESpire + gbc4nspire crash at random under 2.0-OS1.7, though after 1 crash, gbc4nspire worked from then on, and I never re-tested NES.
BrownyTCat, I have always either tried to figure out or logged to the Ndless issue tracker any bug reported and unresolved, since quality matters more than features to me.
But most of the time crashes triggered by TI-Nspire programs are caused by the programs themselves rather than Ndless, since Ndless code is now quite mature and stable. So you should report the problem first to the program authors as DJ_O suggests. I'll then have a look at it if the programs appear to be OK and Ndless might be guilty.