Environment did change late last month, as we installed sharepoint designer on my PC, but we removed it later on, as it didn't meet our needs. That did seem to break my Excel drivers on my PC, as I had to reinstall them, so seem that this is actually the crux of the problem.

The Excel Data source works fine, so does anyone know if a different driver or software is required for the ExcelReader to work? After further testing, the debugger just stops running code as soon as it uses the Excel reader, and running on another PC (not a long term solution, as I had to borrow a collegues) ran the package fine.

Thanks.