Thanks for answering

First, don't laugh, my laptop is five (yes 5) years old , and at that time 32MB was quite OK in a laptop's graphics card; apart from the graphics card the computer is even faster than my 1 year old work laptop. I know I should buy a new computer, but as I don't need to play the latest games, I try to prolong the life of it as much as I can.

While I have the latest graphics driver (from 2004...) I've not recently updated it, but as LarryLaffer recommended in another thread, I'll try with Omega drivers. I'll also try to find the trial version I remember worked well, but if I can't find it on my computer, I don't know where to find it.

And I'll reinstall 6.40 to confirm that it still works, I formatted my hard disk in the summer, and haven't reinstalled A6 yet. The graphics drivers should be the same as I used before formatting, but you never know...
I'm not sure a graphics card in a laptop is swappable.

For the moment I can't say if it is a bug in A7 or not. It seems more related to my hardware and/or drivers, but if I somehow can confirm that 7.0? worked but not 7.05/7.06, then it is maybe possible to at least find out what causes the problem.