Pharo 2.0 scriptaculous does not work

I am a little bit confused and need your help.

Yesterday I moved from Pharo 1.4 to Pharo 2.0.
(In Pharo 1.4. I used the one-click-package).

After moving to 2.0, first it seemed that all worked but now I have the following problem:

Buttons like this:

        html button
                onClick:
                                (html prototype evaluator
                                                callback: [ :script |
                                                                        self halt.
                                                                        2 inspect ];
                                                return: false);
                with: '??'

Dont work (also some other things but I assume that all has the same reason).
Click it - nothing happens.

After some investigation I found out that the scriptaculous example
http://localhost:8083/javascript/scriptaculous
does not work either.
Instead of counting it re-renders the page itself again within the  example.

I took the fresh 2.0. installation (windows) and loaded Seaside and JQueryWidgetBox.

<script src="/files/PTDevelopmentLibrary/prototype.js" type="text/javascript">
<script src="/files/SUDevelopmentLibrary/scriptaculous.js" type="text/javascript">
Is in my html code.

Possibly there is somtehing more to load now?
Possibly scriptaculous is not the reason?

Took me several hours now, help would be fine.
Sabine