Isolation levels, data distribution, execution plans for the select. No direct settings.
If it's a deadlock, it will be detected as such, so the question is why is it just blocking in one environment and deadlocking in the other. Exact same schema and database settings?
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability