We have a developer that started using Reports Builder 10g and keeps getting errors when starting the tool: REP-0201: Zero or negative block size requested (Definition Manager Memory Subsystem) and then... REP-0069: Internal error java.lang.NullPointerException and then... REP-0069: Internal error java.lang.NoClassDefFoundError: Illegal name: oracle/dss/pds/bibeans/xrpds/XRPDS After OKing those errors he attempts to open a report but continues to receive errors. Myself and other DBAs have been able to start Reports Builder with no errors. We all Citrix into a Windows 2003 box where Reports Builder is installed. Our environment variables match the developers. I poked around Documents and Settings trying to find an Application Data or Local Settings folder related to Reports Builder, but found nothing. I googled and checked Metalink but have found nothing related to receiving these error message when simply trying to start the tool. Help? Ideas? TIA. Chris