I have filters made already. When getting mails from senders that I want to include in an existing filter I right-click the mail-address and select "Add to filter". I select the filter on the list and the filter window opens. The mail-address is automatic added as a condition and I click OK to save the edited filter. I then get a warning that a filter with that name already exists and I'm not able to save the edited filter.
This got to be a bug, because I can manually to to the filters list and add an address, hit save and that's it! But the adding address to existing filter doesn't work for me. Any workaround or bugfix?