STATUS: Fixed (But Ugly)
On the Tree View, the red dot icon used for "Selected" items is displayed as a clear/white dot. I'm guessing the reason has to do something with the fact that Allegro uses the FF:00:00 (pure red) color as the "Transparency" color. Though the bitmap images are using the FF:00:00 Transparency for the corners, the red in the dot is specifically set to FE:00:00 so it shows up. It seems my Sun box, or more likely Solaris itself, is rounding my red (FE0000)to the transparency value (FF0000). -In other words, a bit of difference is not enough. ;-)
Heck, I've even tried to use far less "redish" colors like CC0000 and CC3300 but it still shows up transparent on Solaris.
From what I can tell, we're locked to 4-bit (16) colors. Anything that get's close to red is rounded to FF0000 and made transparent on Solaris or made visibly red on MS-WinNT (while unrounded pure red is still transparent). In other words the rounding makes no difference on UNIX (the result is always set to transparent) but on MS-Win the rounding does make a difference (colors rounded to red are shown as red but true FF0000 red is transparent).
The best I could do is use Fuchsia (FF00FF) as a replacemet.