Hi, Can you acknowledge the warning and open the CLD in read only mode or not at all? It sounds like your user roles configuration is preventing access to the CLD. Check to make sure you have at least SPEngineer or SPESimulate included in the roles for the user opening the CLD. The user roles have been expanded considerably in S+E 2.3 so it may be worth reviewing section A of the S+ Engineering 2.3 User management User manual, 2VAA003209-230 A.
Source:2VAA003209-230 A, Section A - User Roles in Symphony Plus
Hi, Please ensure that all the users are present in 2.2 are still exist (case sensitive) and as mentioned in earlier comment add the required roles for write access as suggested in the pop-up message window for that particular user. Refer to the project admin user manual as mentioned in above comment by Alan.