OpenEuphoria

Line 97 of repeat.e has a rogue assert, which I've since removed on the dev copy (in my case for mpfr).

Can you try commenting out that line, running p -cp, and see if that helps?

Ta.

That sudoku.exw you linked to seems to work fine here, at least on the dev version.
Mind you, I do get this when it shuts down:

Warning: tinlib.ew:8106 procedure Register_Dialog is not used. 
Warning: F:\misc\jsudoku-main\tinlib.ew:8038 variable old_style is not used. 
Warning: F:\misc\jsudoku-main\tinlib.ew:7408 variable old_style is not used. 
Warning: F:\misc\jsudoku-main\tinlib.ew:7264 variable hdc is not used. 
[...] 
Press Enter, or d for diagnostics... 

Let me know if you need any help cleaning that lot up - just to prove I could, I got it down to 0 warnings here.