I'm a long term user of both IPVanish and Fopnu.  I've never had an issue connecting to Sock5 (ipvanish) until recently. I add the sock5 data in Fopnu and it doesn't connect.  I get the steady yellow blinking icon; once and a while there's a problem connecting with a proxy etc; not easy to troubleshoot as I've never had these issues before.

In  advance thanks for your support and reading this.

What OS and what version of Fopnu? Has anything on your computer changed since Fopnu last worked, like updates? Has anything changed with IPVanish? Are you running the newest version of IPVanish?