You may receive something like the following error:
Cannot open client [client id]: The Fixed asset client is network locked out by user.
Cannot open client [client id]: The Fixed asset client is network locked out by user.
The above link details steps to try in order to resolve the problem. This can happen in Fixed Assets when there is a network issue, or some older versions of Fixed Assets being used by someone when accessing the shared network location for the client files. Usually updating the app or clearing the lock manually will resolve the issue.