If you upload offline data using Data Source and the TransactionID template, you have 48 hours of time to do the upload of the day you want it associated to. So, if today I upload data that refer to November 2010 for example, these new data will be available in SiteCatalyst and Data Warehouse BUT not in Discover. This is a big issue in my opinion. This depends on the way in wich Discover processes historical data (Discover does not process the historical data but only the last 48 hours).
I do this request: data uploaded with Data Source must be available also in Discover without the restriction of the 48 hours.