Version:            (using KDE 4.3.1)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Sometimes when I open a new KDE session and old konqueror state is restored some konqueror windows are in a strange state (not all restored konqueror windows):
konqueror shows the web page, but when I want to move the page with the cursor keys, or page up/page down, or mouse wheel the top (when moving down) and bottom (when moving up) line (I think the size it tries to paint with new information: small in case of shift-up scrolling, about the size of a line of text with cursor keys and about 3 or 4 lines of text with pgup/pgdn) is updated, the rest of the page stays the same.
At the places where a flash object is supposed to be the start plugin button and a white rectangle moves up and down.

If after moving the page I press F5, it reloads and displays the page correctly.
If I click with the mouse in the scrollbar, the page is moved and rendered perfectly.

When a konqueror window behaves like this all tabs do the same, even new tabs.
If I open a new konqueror window, it works OK.