TorBrowser 4.0: Download progress no longer updated automatically

Used software: TorBrowser 4.0 and Tails 1.2

Problem: The download progress is no longer updated automatically.

Details: If you download a file, you can switch to the download page in the menu to see the download speed, the remaining time and the already downloaded megabyte. Unfortunately, you have to reload the download page manually to see the current progress status. I think, that shouldn't be the normal behavior.