I tried to upgrade Flash to a newer version, this did not work.
Then I've tried to reinstall
flashplugin-nonfree, but this did not work too:
freud:/home/paul# apt-get -t debian-backports install --reinstall
Reading package lists... Done
Building dependency tree... Done
Reinstallation of flashplugin-nonfree is not possible, it cannot be
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
In /etc/apt/sources-list I have:
etch-backports main contrib non-free
First purging the package, then installing does work!
I found here the same problem:https://lists.ubuntu.com/archives/ubuntu-mozillateam-bugs/2008-February/028690.html
Paul van der Vlis.