I am running into this unique issue, until now in our appset via admin view I was able to setup security profiles, I am still able to add users and create teams but when I go to adding new "Member Access Profiles" I get the following message;
Microsoft .Net Framework
Unhandled error has occured in your application. If you click continue, the application will ignore the error and attempt to continue. If you click Quit.....
91: Object reference not set to an instance of the object
Bottom line I am not able to create any new member access profiles due to this. Any help will be appreciated.