Is the data being stored with the report? If so, then you are just viewing the data the last time the report is run and thus you will need to check your connections from the server to your data source.
If the data is not being stored with the report, then I have no suggestions.
FYI: We are using CR XI SP3 (I believe that is the right version), anyhow we are connected to an Novell network and any DB's that we connect to that are on the Network (Access DB's), do not connect. We do not have a solution yet.