Thanks for your fast reaction :-)
- At the site header, there's a search widget with a search-field and on the right a 'search.png' with "submit" functionality.
If the .png doesn't appear, normally there's an alt-text "GO".
Now, with Polylang 1.1.4 none of the above works and I get the 404-image I'm using through the whole site, which is rather big...
The website is at www. podium-arts.com
The previous version I remember using was 1.1.2
I'm turning the search-widget back on for the moment, but you have to try a language other than English, through the flags.
Thanks again.