Link in Activation email giving incorrect URL (please help urgent)


I'm encountering a strange behavior with activation emails at my site

When users receive their activation email they get links containing 'blogrol'

like this:


when it should be:

Where may this me coming from?

(I've now disabled sign-up verification using the 'remove-email-verification' plug in but would like to fix the root of the problem, not just the symptom, as I'm sure this affects other areas as well.

Many thanks for your assistance.