Earlier this year, an issue was discovered with a Microsoft update that caused File Geodatabases stored on a network location to become corrupt. More details of this issue can be found in this Esri UK Technical Support blog article, and Esri Knowledge Base Article 41119.
We are pleased to announce that Microsoft has released a fix for this issue, which has been designated KB2732673. Esri have tested this fix, and can confirm that it resolves the issue described above.
Please download and install this fix at your earliest convenience to avoid being affected by this issue.