try running ccrstest.htm (refer to RCC Trouble Shooting PDF), with start and stop date and time allowing for maximum of three hour interval after the time of the problem (e.g. 29/12/10), type (RPT - historical RePorTs).
If this provides data, then at least BCM has the data.
Stop RCCLauncher on RCC server. Copy the logs directory (something like c:\program files\nortel\Reporting for contact center\logs) to similar e.g. logs_old, so the correct logs directory is now empty. Then start RCCLauncher.
Examine any logs it produces, in particular any bad_xml logs.
Also you can log onto the RCC database under command line (I don't have details to hand), and examine the rptrequesttimes table. You should see currentbcmtime show correct time, and subsequent calls should show it current time....this is a good sign. Also the rptrequesttimes should show enddate and current date, I'd be interested to know what these are.
Hope this helps. Let us know.