Yes, I know. This is a friends' site that I occasionally post in and help her run. She never upgraded because it was working OK, so why bother, right?
Well, we need to upgrade for obvious reasons.
As I look at the documentation, I see the following paragraph:
If you are upgrading from a version earlier than 1.2.4 please note that all the functions previously found in wp-content/mu-plugins/ have been moved into wp-includes/wpmu-functions.php. Please remove the files in wp-content/mu-plugins/ to avoid any potential conflicts and errors.
To me, this implied that that I should be able to upgrade directly, without doing the upgrade to say, 1.3 then to 1.5 then to whatever ...
This is a very small site with two active blogs running.
You advice and sympathy is much appreciated.
And no, this is not the OTHER site that I've been having trouble with recently.