By the way – just to note it somewhere – the topic level RSS feed on this forum doesn’t appear to work at all.
OK sorted it out and yes – as you guessed it was my fault! As usual 
I’d pasted the Akismet key into config.php but because it previously defaulted to false I ommited to add quotes around it which it needed. Add the quotes and it installed.
I’m probably not the first with this one and almost certainly wont be the last!
Thanks for your time and effort.
Mac OSX – Apache 1.3.33 – PHP 5.1.4 – MySQL 5.0.20a-standard
Was about to take a look at the install script..!
Apologies for the delay – I was called away.
Coming up blank here. Tried it with localhost and then also tried it defining a virtual host (which is where I have wpmu set up as it happens) and still the same result.
I’ll take another bash at this tomorrow but I’m out of ideas…
I’m not sure how to tell whether it’s readable? If, for example, I drop a phpinfo script into the ‘forum’ folder then I can display that OK – as I can the image in the forum/bb-images folder.
And yes – I am attempting to run the /forum/bb-admin/install/php script. For the record, trying index.php gives the same blank screen.
Puzzling! As I say my WP test site has been running successfully for a long time as has a local copy of Gallery2.
