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XF86_Mach64 failure in 16 bpp mode



Hello.

  I have problem with running  Mach64 server from 3.2 release
in 16 bpp mode. When I do 'startx -- -bpp 16' I get something
VERY strange in 800x600 mode: the narrow leftmost strip of the 
screen is duplicated many times and fills up the whole screen.
When I do Ctrl-Alt-+ to 640x480 mode everything is OK. Switching 
back to 800x600 gives back this weird behavior. The same 800x600
mode works fine with 8 bpp. 
  When I used beta versions from 3.1.2 release ( 3.1.2D and up),
I had no such problems while using exactly the same setting for
800x600 mode .
======================================================
 Here is description of my video card.
=======================================================
 
First video: Super-VGA
	Chipset: ATI 264CT (Port Probed)
	Memory:  1024 Kbytes
	RAMDAC:  ATI Mach64 integrated 15/16/24/32-bit DAC w/clock
		 (with 6-bit wide lookup tables (or in 6-bit mode))
		 (programmable for 6/8-bit wide lookup tables)
	Attached graphics coprocessor:
		Chipset: ATI Mach64
		Memory:  1024 Kbytes

=======================================================
 The relevant parts of XF86Config file :
=======================================================

Modeline  "800x600"     50     800  872  992 1040    600  637  643  666 +hsync +vsync

    Subsection "Display"
        Depth       16
        Modes       "800x600" "640x480"
        ViewPort    0 0
        Virtual     800 600
    EndSubsection 

========================================================

I use Slackware96 distribution and fvwm95 window manager.

I would appreciate your help

    Boris Zingerman.