Do you same behavior on the demo.piwik.org ?
have you customized piwik at all or plain piwik? try in different brower? Try delete tmp/assets/* files to reset the javascript?
On the demo.piwik.org, if I click on dashboard and all websites, I see the go button momentarily and it goes off once the page loads up. On my piwik, it stays there until you manually click go.
I do not have any files under /tmp/assets/ folder to delete.
I tried the latest version Piwik 1.8.4 and I do not see this problem. I did the upgrade by renaming the config/config.php file and running installation process, reuse existing database.
The version of the piwik interface still shows 1.8.3 ? is there a datascript I need to run or what ?