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When logging in to the Web module, user sees error "Unable to get property 'Mid' of undefined or null reference"
The application is unable to access data needed to build the home screen, due to role permissions.
The workaround is to ensure that permission is set to something other than "None" for at least one of the following security roles, for each role assigned to the Web user:
Read Client Actions
Read Entity Actions
Read Audit Actions
The v4.2.0.6 release is changed so that it is possible to set these roles to 'none' for Web users.