When using 'Quick Add' with the 'To Grid as Reactant' option to add a ChemACX compound to a reaction it will not populate the stoichiometry grid's values for Molecular Weight, Molecular Formula and Exact Mass.
Cause: This happens when the compound does not contain property information in in the ChemACX database. This information is directly provided by vendors and if they do not include the data the ChemACX database will not have it available. You can report CAS Numbers missing data to Support to bring them to attention of the ChemACX Team.
Workaround: Use 'Quick Add' with the 'Left of Arrow as Reactant' option. This will add the structure to the reaction drawing and allow the application to calculate the missing values.