Viewing Query In EM Is Blocking

EDIT: Oops in the title. I meant "EM" not "IE".

I'm on a Dev database (full copy). In EM (that is running on the Dev server) I run a view that I used to build the list of rows to be updated.

SQL 2000 Std SP3 on Win 2000 Server.

When I cut-n-Pasted the clause to my "Update" statement in Query Analyser and try to run it, to my surprised, it got hung up.

I looked in EM to see Locks, and to my surprise my EM View Display is blocking the Update! So; I press "Cancel" on my EM View display and, whammo, the update goes.

I tested and it's consistant and does not matter what column I'm updating.

Is this normal behaviour for EM?

EDIT: I tried the exact same scenerio, in the exact same EM and QA screens, but this time remoting over to the Production box (since it's midnight). The blocking did not occur. Weird!