Am still back at Squeak 3.8; apologies if this has been fixed in more 
recent versions.

I've suddenly run into a really vexing problem in which the usual 100% 
bit-compatible behavior of Squeak is not quite there. I'm just about 
finished with evacuating Apple and moving my life to Linux. My desktop 
machine is Slackware 12.2, KDE 3.5. Everything works fine. My new laptop 
has a Radeon video driver, runs Slackware 13.1, KDE 4. I'd noticed some odd 
effects on the laptop in terms of some things showing up strange shades of 
gray when I expected them to be black. Now it seems I can figure out 
approximately when this happens: 16-bit forms. My 16-bit forms are showing 
on my 32-bit color on the laptop as if they were 32-bit forms with 16 bits 
of precision, or something of that kind; I'm certainly *not* getting 16-bit 
black showing up on the display as 32-bit black. When I pop on an SVG 
monitor to the laptop, the color anomaly occurs there too.

Is there a preference I can set to fix this? This problem is going to 
really hurt if I want to present from my laptop.

-Thanks, Jim