I used PM 5.6.4 on a MacBook Pro running Leopard 10.5.2. Camino is currently my default browser.
Things were fine until I had a problem with my laptop and ended up erasing the drive and restoring everything from a back-up clone. Now, even though Camino is my default browser (and is automatically opened and used at all other times), when a URL is sent as an attachment and I choose the attachment from within PM, it tends to open the web site using an ancient copy of Explorer that I have among my applications. I would appreciate any guidance about how I can adjust the settings so that PM always uses Camino (or whatever I choose as my computer's default browser). Thanks for your help. Ken