About reinitializing ....

This is to do with SQL 2005 merge replication (HTTPS if it matters)

Is there any difference between marking a subscription for reinitalizing via Snapshot Monitor, and having the subscriber mark it for reinitialization ?

Thanks
Bruce

Probably the same. See if what you're doing is the same as in BOL topic "How to: Reinitialize a Subscription (SQL Server Management Studio)".