https "queuing" issue

I use AirDroid web to sideload certain apps on my Android phone. Prior to the availability of https for AirDroid web, it always worked quite well. If I login to AirDroid with https, however, as soon as I select an app for installation, the progress bar hangs on "queuing"; sometimes it will ultimately install, sometimes not. If I log out of AirDroid web (https), and re-login with http, it still works flawlessly.

Bug?