Filtering from charts with non-ASCII characters are passed without modification to the IE URL, which then fails. In Chrome the non-ASCII characters are converted with %.
Filtering the same names in the side table filter works fine, django sorts out the %.
It's likely we need to use
django.utils.http.urlquote or something. https://docs.djangoproject.com/en/1.8/ref/utils/#module-django.utils.http
from django.utils import http http.urlquote("Ländryggen DX") u'L%C3%A4ndryggen%20DX'
Is this something you might look at @David Platten?
Initial bug report was from Love Kull