[plt-scheme] Test Cases not working

When using test case boxes I am getting the following error: "#%top- 
interaction: not at top level". For both *Beginning Student* and  
*Pretty Big* languages.   I am using DrScheme3m version 369.2- 
svn27dec2006.

Is this a bug? Or do I need to do some compilation or preferences magic?

Thanks,


--
Jaime E. Vargas
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