Editing an album's info refreshes the page (and thus breaks uploading).
I just edited the name of an album whilst the upload was running. After hitting the save button the page refreshed. Didn't expect this as the editing window is in an overlay. Expected the overlay to close/disappear whithout refreshing the page.
Perhaps it's an idea to move the upload functionality into a popup? That way one can keep on navigating through the albums and stuff ;-)