clicking the blue arrow does nothing

(fixed a typo in the title and...)

BTW, firebug reports no javascript errors.

I do: http://www.common-paradise.net/illustration/gallery
Tested with FF on XP, with and without the extension, as well as with FF on Linux.

OK, I've done some more debugging.
Not yet done, but here are my first results:

In piclens_views module, in function piclens_views_mediarss_items, $args is used twice: Once as a parameter to the functions, which includes the name of the view, and then as the array of arguments passed on to views, in views_build_view.

To fix this, the first line should be:

<?php
$viewtitle = array_shift($args);
?>

Now the problem is that the arguments are not passed to the feed. If I add them manually, I get the RSS feed: http://www.common-paradise.net/illustration/en/piclens/piclens_views/gal...

("Growing+children" is the argument)

Got it!
I leave you to beautify the code, but I found the second breaking point:
In piclens_views module, in function piclens_views_post_view, the arguments passed to the view, are not passed to the feed_url.

Try this instead:

<?php
mediarssapi_feed_url(url('piclens/piclens_views/'. $view->name . '/' . implode('/', $view->args), $filters), $view->title);
?>

And now it works :)