We have discovered a bug in FileMaker Pro 16.
We have an unstored calculation that sums up a number field from all the related records in a portal. The related records are actually in AN EXTERNAL FILEMAKER FILE, because this is a very old FileMaker system where each table was required to be in its own file.
After changing the number fields in the portal, the unstored calculation does NOT refresh. We have to manually perform a "Refresh Window" command to get the unstored calculation to update.
This was NOT a problem in FileMaker Pro 15 -- it just started in FileMaker Pro 16.