MFC-665CW FAQs & Troubleshooting MFC-665CW Not your product? Sort by: Updated Date Popularity 3 Results 1. 05/15/2013 I am using Voice Over Internet Protocol (VoIP) and I'm having problems sending faxes. 2. 04/25/2013 I am experiencing problems sending a fax. 3. 08/02/2012 The rainbow cursor keeps spinning when I click on Copy/PC-FAX in ControlCenter2 (For Mac OS X 10.7). Fax FAQs & Troubleshooting