According to Davidson & Associates, Inc., the developer of The Cruncher, this is a known issue with version 1.21C. Users can workaround this issue by turning off the Modern Memory Manager in the Memory control panel and restarting their computer. After restarting, users should be able to change Cell Attributes normally. Davidson is currently working with Apple to correct this.
For the latest information regarding The Cruncher users should contact Davidson & Associates directly. The Tech Info Library article titled "Locating Vendor Information" can help you search for a particular vendor's address and phone number.