I seem to have resolved my problem with Chrome and ancestry.
Unfortunately, I can't tell you what I did to fix it.Initially I started looking at one issue at a time and checking to see if that worked. Then I got frustrated and tried multiple things at a time.
Short version ... it's working now.
I didn't uninstall and re-install Chrome but I did clear cache etc - all the usual housekeeping things. One other thing ... I disabled that annoying AVG extension 'AVG Do Not Track'. Don't know whether that had anything to do with it or not. Mind you - I've had this extension enabled for quite some time and everything was working okay.
Who knows? ... glad that everything is working again. Good luck to the other sufferers. Hope your problems get resolved soon too.