sp_unprepare

Hi, I was wondering if anybody has ever had a problem with blocking and the sp_unprepare statement. We have an application that is inserting data into a table and the process will freeze until we kill spid executing the sp_unprepare statement because it is blocking another spid. We have just recently upgraded to SP2 could this be the problem?

I got the same error with SQL Server 2000 and the worst it only happens in the client site...!

Somebody could give us a hint...