Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc version 4.3.1 (Gentoo 4.3.1 p1.0)
 
OS:                Linux

This is related to 4.1 prerelease version from svn.

when browsing certain sites konqueror adds to the status bar 2 buttons named fit and 100% and a horizontal slider, which never get removed (and don't seem to control anything either)

The problem is that not removing those buttons results in adding more of these buttons each refresh of the page, eventually leading to expanding the browser to accomodate the numerous buttons and sliders on the status bar - this eventually leads to the browser growing larger than the desktop.

A site easily proving this is outtherecomic.com just point konqueror to it, wait for page to load and press refresh... depending on your desktop size you might need to press refresh more times.