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There are a few known issues which can crop up on XNAT installations when users log in. Most of these are rare, and some can be addressed or mitigated by updating to the latest XNAT release.
XNAT 126.96.36.199 addressed a severe performance issue related to logging in that affected "super-users" who did not have Admin access, but who have any kind of access to hundreds of projects. This is a rare situation, but for these users the login process could take minutes, prior to upgrading. If you see issues like this on the latest version of XNAT, please report them.
JIRA Issue XNAT-5804 - Allow user to clear their own data type cache
New in XNAT 188.8.131.52, performance of page loads and data listing display have been improved overall by caching data type listings on Tomcat startup. This cache should be updated for all users whenever a new data type is installed, or project permissions are changed. However, if a user logs in and it appears that this user does not have access to data that they should, it may be that the user needs to refresh this user cache. After the user logs in, follow these steps:
The user may need to log out and log back in to see project access changes. Data type listings should come back right away.