connection to data source could not be established

DB just crashed after a few hours work. Did several saves along the way, but last backup was yesterday.
The error I’m getting is Connection to Data Source “SAS Member Master” Could not be established. The error occurred while working on Report Builder. I looked for the Java Runtime, it’s checked (your response to another similar post). DB enclosed. Don’t know where to go next.

Opens right up for me. Check internals - OK; All forms, tables, views, queries and the report you were working on show OK.

Re-boot system? Reset user profile? Broken LO? These are where I would look first.

File in use be another application?

Problem appears to be solved. There were 2 LO processes running in the background. I stopped those processes (Task Manager) and now the database tables will open.