Tux Paint

When I downloaded the program and stamps files not all the stamps showed up (compared to what I see online).  Some of the stamps buttons are colored but with no picture and when I press it, the description shows up at the bottom but there is no picture on the button nor does anything show up on the screen.  Are some of the stamps only on the purchased CD?  
I'm using the 0.9.21 version on a Mac OS X 10.6.3.

Hello.

I am a fan of tuxpaint, and my kids love drawing with it, I mess around
with it as well sometimes, It's a great app.

I have a question about the kaleidoscope feature, basically I want to
know if it is possible to make the lines a little thinner ? I have no
idea where this might be changed, or if it is possible to do it.

I'm running Ubuntu lucid (10.4) 64bit and the tuxpaint version is ---
Version 0.9.21 (2010-08-03)
I would appreciate an help you can give me.

Many thanks.