Minor issue this, but if in the issue type/priority/severity administration screens and using the Edit | Bulk Move feature to move issues (e.g. when migrating to the new values), there is a screen refresh issue when the edit dialog pops up - it shows the issue counts as they were before you started moving them.

They are correct again when the dialog is closed so, as I say, not a big problem, but a bit alarming when you first notice it!