Why does capella suddenly require me to enter a number between 1 and 999?
In some rare cases the installation procedure might generate extremely high or negative values for for some system parameters or the relevant files have been damaged or deleted. These values can be re-set at extras | options | view and colors | screen refresh or at extras | options | general | backup copies or at extras | options | general | undo function or at extras | options | general | moving graphics and symbols. Please replace the indicated value with a positive number from within the indicated range (i.e. 1 to 999). As regards the entry for moving graphics and symbols, the value should normally be 16. In most cases a once-off correction will resolve the issue.