Sorry Garvin, but the 1.1.1 release didn't help.

It's probably my IIS / PHP setup. And confused a bit by my using my laptop to develop multiple websites - which XP/IIS doesn't support any longer ;-)

I'm probably better to simply move on and start the huge learning curve to get it running under ...

Now I'm getting real confused.

The PHP 5.2.1 php.ini file has:
[filter]
;filter.default = unsafe_raw
;filter.default_flags =
which sounds like what you suggested

... but google turned up http://trac.wordpress.org/ticket/3093 which states The default filter is unsafe_raw, but hosts will quickly ...

Thanks Garvin !

ret2's report only applies to PHP 5.2 versions, actually unrelated to whether its Linux or IIS, and also depends on which ext/filter settings you enabled.

Oh shoot !! I just upgraded to latest MySQL and PHP versions before installing Serendipity ! I'll have to check my new linux ...

I have the same problem on a new Windows IIS install ... clicking ANY of the links on the left of the Administrator page asks for login details then returns to the blank Administrator page.

I have the same default session values in php.ini - are these correct, or what should they be set to ...