I almost feel bad for reporting this it is so trivial.

I am running Amarok 1.4.6 on Slackware 12.0 so this may have been fixed in a later release. This bug occurs when downloading multiple podcasts. The view all downloads icon isn't reset when all the downloads are completed.

Steps to reproduce:
1. Start downloading more than one podcast (right click and select Download Media)
2. Click the icon (double arrow pointing up) in the center of the bottom status bar
3. Wait for the downloads to complete and the progress window automatically closes
4. Start at least two more downloads
5. Click the icon again and nothing happens
6. Click the icon a second time and the progress window shows up

heh, yeah, reporting bugs for quite old versions could well be a waste of time - I'd strongly suggest updating - there has been podcast work done, amongst other stuff.
If the issue still occurs with 1.4.9.1 then an official bug report on http://bugs.kde.org would be helpful.