Eric, I just noticed you have a 192x64 display on your site noted as compatible with the PlaygroundGLCD library http://www.seeedstudio.com/depot/graphic-lcd-19264-ks0108-ctrl-black-and-white-p-143.html
I am a little surprised it works. The library code was written assuming two controller chips each up to 64 pixels wide. Does the panel have two controllers each 96 bits wide or three controllers?
Has it been tested with the library?
If it doesn't work, send me a Personal Message and I will see if I can help with some mods to the library to get it going.