Adobe Type Manager 3.6 used in System 7.1 is incompatible with ClarisWorks 1.0v3.
ClarisWorks cannot build the Claris Fonts file if ATM is on.
Work around:
1) Turn off ATM
2) Open ClarisWorks. A Claris Fonts file will be built.
3) Quit ClarisWorks.
4) Turn on ATM.
ClarisWorks can be used as usual.