The “MAS has stopped working” message can be caused when upgrading from an older version of Sage 100 (MAS90 or MAS 200) and using a custom check form. The upgrade does not correct an issue with the check form and can cause the error message to pop-up when printing. But, don’t panic. There’s a simple solution.
In Sage 100, create a new check form in Accounts Payable or Payroll. You will need to manually re-create all customizations to the check form. Do not copy the older version of the check form over to the new one.
That’s it! Simple as that.
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