Both the source version and target version of the Sensor must be whitelisted as "supported" in the Console.
Console 4.9.0 whitelists only Sensor 4.9.0 as supporting upgrades.
This means there won't be anything to upgrade _to_ until Sensor 4.9.1 becomes available.
The Console's whitelist is hardcoded, requiring a Console at least as recent as the sensor versions involved.
For example, Console will have to be upgraded to 4.9.1 before upgrades to Sensor 4.9.1 may be performed.
Alert filtering may now select "Info" level alerts.
The yellow "Unable to connect" bar now floats at the top of the page. Previously its presence displaced page content, causing page elements to shift down and up unexpectedly.
Pressing enter with the cursor within the Policyset Name input no longer saves the policyset.
The "Refresh" button on the Resources page was misbehaving and has been removed. Use browser's refresh if needed.
"Beta Features" has been renamed "Optional Features". Integrations is no longer marked "Beta".
Navigating away from New Workflow or Edit Workflow after making changes does not trigger a "Discard unsaved changes?" prompt.
An unexpected "Discard unsaved changes?" modal appears when the user: opens An Integration Configuration modal dialog; does not make changes; doubleclicks outside the modal. This is a visual-only issue; it is safe to click either "yes" or "no" to make it go away.