Looking at the site in Fire Fox, it looks like there are many CSS and JS Resources that are not updated to the server,
clicking the send preview link shows the following JS error:
ReferenceError: CKEDITOR is not defined
[Break On This Error]
content: CKEDITOR.instances['editorField'].getData()
this suggests that the webassist/ckeditor folder is not fully uploaded to the site.
make sure that all of the power messenger files are being properly uploaded.