Interesting. When I cleared cache for front page and specific posts (from my blog, in Chrome), I could then see those in FIrefox, but not Safari. However, the minute I went to an older post, for which I had not cleared the cache, back to garble in Firefox.
I disactivated my WP Super Cache plugin. That did nothing. In fact, now even the front page and recent posts are garbled in Firefox (and still in Safari).