Well, it was (or better, it IS) a font problem....
I renamed Fonts dir and Autocad started well as before.
The strange thing is that after remaking Fonts dir, all goes well...
Besides of this strange behaviour, i noted following, all with wine-only
setup :

1) After installing some apps that sets up some fonts too, wine starts
   showing boxes instead of text chars.
2) Erasing Fonts dir 'solves' problem, I don' t know why.... Maybe
   they use some default Linux fonts ?
3) The problem is of course better solved copying fonts from windows
    Fonts dir, taking off some of them which have problems loading.

Regards

Max