I have a Matrox Millenium G400 MAX and during the install it was chosen as
some other type of G400 (I'm afraid I don't recall which).
I clicked on the G400 MAX w/32 MB of RAM option but then there were radio
buttons to select the amount of video ram and it only goes up to 16 MB.
For lack of a 32 MB option I chose 16 MB and then had to go back and
manually fix the XF86Config file.
It would be nice if that was made clearer whether I needed to select a
radio button or not and if a 32 MB option were added.
This has been added to a list of features for future releases.
Should be fixed in pinstripe.