A first step is looking in the EventLog under "Windows protocols" / "application" for warnings, but especially errors regarding SpaceObServer and DataCentral (on the machine that is running DataCentral).
If a file cannot be indexed or searched, it could make sense to share this file with us via email to spaceobserver@jam-software.com.
If there is another problem, please contact our support.
We might ask you to provide us log file of DataCentral, which are located at C:\ProgramData\JAM Software\SpaceObServer\logs