Sometimes when calculated fields are imported as part of a managed solution, they stop working (no longer calculate, are blank).

Microsoft support have stated that when this happens, these fields need to be re-indexed.

At the moment the only way to do this is to manually update, save, reset and save each problem calculation in the default solution.

It should be possible to kick off a re-indexing of all calculated fields for an environment, or even better - this should be part of the import job and done automatically upon manage solution import.