Why do the yellow tooltips appear even when Dashboard is closed?

This is a bug in Dashboard itself unfortunately. We've reported the problem to Apple and we're hoping they'll fix it. In the meantime, there is a hidden setting to disable the tooltips that show delivery details. Open Terminal, enter this on one line, then press return:
defaults write widget-com.junecloud.widget.deliverystatus disabletooltips 1; killall Dock;

To turn the tooltips back on, enter:
defaults delete widget-com.junecloud.widget.deliverystatus disabletooltips; killall Dock;

Software

Deliveries 1.1 for Mac Available on the Mac App Store Deliveries helps you keep track of all your packages, so you always know…

Junecloud Sync Deliveries for iOS, Deliveries for Mac, Notefile for iOS, and Notefile for Mac all sync automatically using…

Deliveries 6.1 for iOS Available on the App Store Deliveries helps you keep track of all your packages, so you always know when…