Perhaps in the reinstallation of MAX the configuration data files have been corrupted. One way we can check this is to close MAX, and then delete the Data folder found in C:\Program Files\National Instruments\MAX. This will basically give you a clean slate in MAX to start from. WARNING: Deleting the Data folder will remove all MAX configurations. New configuration files will be created when MAX is reopened. If this is something that's possible for you, please try it, and let us know if it allows you to reopen MAX and move on. If not, we'll keep trying.
Logan S.