Although the Test Connection, RW quits (and asking to send a report) at the very end of each attempt to republish my website which I successfully published yesterday.
I am absolute beginner and have no idea what’s wrong.
Any suggestions welcome 
Not sure if it will help, but I was having that problem with RW 6.3.4 and El Capitan. Installed the 6.3.5 latest beta and got it fixed.