This blog is now back to normal as far as I can see. Apparently the whole upset was caused by one misplaced “>” in an HTML sequence in a post. As there are a huge number of posts on this blog, it took a long time to track down.
Troubles always come in threes, so they say, and I was also having unrelated problems at the same time with my domain name (markforster.net) and my email address. I am pleased to say that these have now been fixed too.
As a result:
1) you can use markforster.net or markforster.squarespace.com as before
2) you can email me on either mf@markforster.net or markforster@aol.com. It doesn’t matter which you use, but please don’t use both at the same time
Thanks everyone for your patience.