this is a bug that exists, I assume, since v 1.0 and I always thought that it is so obvious that you will deal with it on your own, but obviously not.
do this:
the result is, that the connection uses the old settings, not the one you just changed. for these changes to apply you must close the filter dialog and re-open it.
I will enter a bug report for that.
Thank you
David Hervieux