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Hi, Chris -
It sounds like something changed in the underlying SQL Server - What happens when you right-click the data source and de-select "Use Extract"? Do you see problems in the data source when you are connected directly to SQL Server itself?
Thanks for the reply. The data sets are quite big (some 1.6 million rows) so connecting live is difficult.
After some further investigating it seems the server had run out of disk space, so the reports were unable to save successfully. I've cleared it out and now the reports are running fine.
Again, thanks for your help.