Version:            (using KDE Devel)
Installed from:    Compiled sources

When there is an external browser set up in the Component chooser,
And you use konqueror to open a website that has externally linked popups/ads
konqueror renders the page 
but opens the popups/flash/ads in the configured external browser instead of in konqueror.

For example, after enabling an external browser,
visit slashdot.org or news.com.com in konqueror,
and the flash banner ads will be opened in the external browser instead of within konqueror.

I'm not sure if this is a bug in konqueror, or in khtml.  It is kind of a corner case, since most images etc load properly, but it is quite a nuisance.