We've published reports to the server running Crystal Reports Server XI. Some of our reports pull without a problem, but other times the webpage locks up for the end user. We've received errors saying Transport error: Communication Error, Transport error: invalid object reference (found in the event viewer of the server). We are querying a SQL 2000 server database running Windows 2000 server. We changed settings in Regedit for script timeouts, which we had to do in Crystal Enterprise 10 (this is on a different server). This seems to have helped display the reports sometimes, but not on larger reports. The first page will display occasionally and show there are more pages, but when clicking the arrow to view the next page, we receive the error "An error has occurred: null." The same error also occured when trying to print the report. The reports we published had been created in Crystal Reports 10 and when we received Crystal Reports Server XI, we just published them as is. Any suggestions on what to try?