We upgraded to .24 yesterday and I have been doing a lot of work in KPM today. Changing the policy deployment interval and clicking save disables outbound email (System > Outbound Email). When re-enabling outbound email, as you click the "Enable" button and the feature is re-enabled, the grid refreshes and displays the KPM policy deployment settings screen until the refresh is complete. In fact it seems to show this screen in the grid for any link from the left hand navigation tree under the System module until the grid refesh has completed.
We can consistently re-produce this issue.
Have raised a Sev 2 ticket # 197433