just thought you'd like to know I found out what caused the problem I reported (the freeze and black screen upon launch - if on fullscreen - or when shit-F4ing to fullscreen).
Almost a year now, and I defined some 18 AI drivers (names). From then on, I have pretty much kept them all and race against them at several tracks.
So, I was looking for differences between the z28 files and the copy&pasted 0.6A4 and found none. Of course, the reason being I had used ALL my original files from the z28 version, and copy&pasted the 0.6A4 into it.
drv.nam was there.
Take away this file, no crash.
Put it back in, crash.
Take away and launch from fullscreen and iterate between full and windowed, no crash.
Put it back in, and do the above, crash (freeze+pitch black screen).
Just this file.
That was basically what I had missed (and the one difference between a fresh z28 install and the one I had - other than the controls configuration, which cause zero problems).