This problem is caused by a corruption of the table which keeps track of the active breeding group. The only way to fix this problem is to reinstall Wildcatt.
If you have not purchased any updates since your original purchase of Wildcatt, delete the Wildcatt directory and reinstall your original diskettes. (If you have made any notes attached to hybrids and wish to preserve these, copy the files usrnotes.db, usrnotes.mb and usrnotes.px from the Wildcatt\working\user directory to another directory, and move them back after the installation is complete).
If you have purchased updates since your original purchase, simply reinstall your most recent update. It is not necessary to move the usrnotes files in this case.
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