Hi

It isn't actually bug, but it was confusing.

Problem:

When I click on link in message body (using KMail) there is strange behavior - on task bar appears many windows (I unable to maximize it) with Konqueror icon. It looks like infinite loop - windows in task bar appears continually and system notification time to time inform that copy is completed.

Diagnose:

After Update to Kubuntu 10.04 something goes wrong and system configuration is broken - default browser is set to other browser, and this browser field is empty. System doesn't know which browser to use.

Solution:

In System Settings -> Default Applications -> Web Browser and type your favorite browser: "opera" "firefox" or check first option without typing browser and apply.

It simple but annoying.

I hope it helps someones and save someones time.