QB Issue Resolution:

Yes, this is a bug that happens when your encryption fails.  In turn, it fails after changing your Admin password, which is now required by Intuit.   As a result, this is likely to happen on a much more frequent basis now.

This may help: QuickBooks Support – How to try to fix Nasty Encryption Error

Resolution for Issue 'All “sensitive information” fields corrupted upon opening QB Pro 2016 this morning.' available: Yes (Solved).
Source: Intuit Community forum.

All “sensitive information” fields corrupted upon opening QB Pro 2016 this morning.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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