When GP Power Tools Build 28 was released, it added a new Product Version Validation feature. One function of Product Version Validation is to warn when it detects Dexterity Product Dictionary version mismatches.
A dialog will be displayed after logging into Microsoft Dynamics GP explaining which product dictionary versions are mismatched for the current workstation. Once dismissed the application will continue as normal. However, mismatched product dictionaries are a security and data damage risk, and the issue should be resolved as soon as possible.