[Newbies] Squeak hangs when using System Browser

[Joey C]

Hi everyone,

Today's my first day playing around with Squeak. I've been following Squeak By 
Example's eBook and image (http://www.squeakbyexample.org/). 

Everything was going great until I fired up the System Browser and started 
browsing. I can select a category but as soon as I try to select a class, 
everything becomes unresponsive. 

Just wondering if anyone else has run into this issue? 

Thanks,
Joey