I have changed my Basecamp login to use OpenID. Can I use still use TrailGuide?
Yes. However you need to use a special User ID and Password that Basecamp provides for applications like TrailGuide that use the Basecamp API for accessing data. If you have enabled OpenID login, go into the user info screen in Basecamp and click the link that says “use this username/ password” to show the information you need to enter in the TrailGuide Account Settings screen. Then enter those settings in TrailGuide.