Known issues are features in your the product or software that might temporarily require a workaround. Known issues are typically documented in section 7 of the Readme file. Readme files for Trend Micro products, along with the latest copies of the product manuals, can also be found in the Trend Micro Download Center:

Known issues can be found in the technical support Knowledge Base:

Trend Micro recommends that you always check the Readme file for information on known issues that could affect installation or performance, as well as a description of what’s new in a particular release, system requirements, and other tips.