Google Calendar JavaScript Alert Dialogs Cause Hanging

[sha1sum]

Version: 2.0.0
Service: Google Calendar

Background

When Google Calendar pop-up alert dialogs are shown for event reminders, Manageyum becomes unresponsive for a good while after a button is clicked on the dialog. Keystrokes seem to be ignored, though sometimes clicking somewhere inside Manageyum with the mouse will cause the keystrokes to appear in input fields, which leads me to believe they're being queued but a process, thread, mutex--something--is locked somewhere.