Resolved: How to make ImageMap mode = "key" work

I'm having some trouble figuring out why this doesn't work. By all accounts it looks like it should. I haven't debugged T2D yet, but maybe someone else has gotten this mode to work.

Here's the image I'm trying to load: mysite.verizon.net/jasoncahill/game-font.png

Yes, I know it has a fixed "cell" width and I could just use "cell" mode. I'm trying to get "key" mode to work, though, and this was a simple image I had laying around.

Here's the datablock definition I'm using

datablock fxImageMapDatablock2D(CourierFont)
{
   mode = key;
   textureName = "~/client/images/game-font.png";
}

When I run in T2D, I get the following console output:

fxImageMapDatablock2D(t2d-font/client/images/game-font.png) - Non POT bitmap loaded padding with approx 58164 bytes of video ram!
fxImageMapDatablock2D::calculateImageMap() - No frames have been acquired! (CourierFont)
t2d-font/client/client.cs (69): Register object failed for object CourierFont of class fxImageMapDatablock2D.

OK, things to note: My bitmap is not a power of two. It's 381x145. Second, my "frames" are fully encased in a one-pixel-wide magenta border, even including the right and bottom. When I pad out the image to 512x256, it claims to "acquire something" but not the 100 frames I'm expecting. I can't seem to make it draw anything with only that change.

Obviously, this datablock definition works:

datablock fxImageMapDatablock2D(CourierFont)
{
   mode = cell;
   textureName = "~/client/images/game-font.png";
   cellWidth = 19;
   cellHeight = 29;
};

Any thoughts?

For s****s & giggles, I've attached a POT version of the image as well: mysite.verizon.net/jasoncahill/game-font2.png. This version results in the following:

fxImageMapDatablock2D::calculateImageMap() - No frames have been acquired! (CourierFont)
t2d-font/client/client.cs (69): Register object failed for object CourierFont of class fxImageMapDatablock2D.

And, lastly, here's a POT version without the magenta in the unused space. This results in no warnings, but doesn't appear to have any frames: mysite.verizon.net/jasoncahill/game-font3.png.