Safari Problems

Over a period of a few weeks now, Safari has developed a few minor quirks. It is frequently very slow loading web pages, refuses to load certain sites at all, but most irritatingly is that Safari quits automatically whenever I log out or switch user.

If anyone has a "fix", I would be grateful for the advice.

What level Safari and OS X?

I'm running Safari 9.0.2 on OS X Yosemite 10.10.5 on several iMacs and MacBooks with no problems.

Same here.

Interesting, I'm using 9.0.2 and El Capitan on my iMac and am having similar issues.