[Hummingbird] Hummingbird Dashboard Notice Will Not Close

We moved a WP 4.9.9 multisite network to WPEngine and now Hummingbird is displaying a dashboard notice that will not close.

"We've noticed you've made changes to your website. If you’ve installed new plugins or themes, we recommend you re-check Hummingbird's Asset Optimization configuration to ensure those new files are added correctly. Dismiss this notice.

Re-check Asset Optimization Clear Cache"

The message will not close or go away.

Can this be addressed?