Well, I can access the forums from my work PC via Chrome. Last night on my MacBook running the lastest version of the OS I cleared my history and deleted all cookies from Safari. Then I navigated to photo.net and was able to see all the forums. Great, I thought. I then logged in and clicked the Forums link next to my profile pic. Got the error message.
I don't have any issues accessing other sites. I'm on several other photo and motorcycle related forums and never had an issue. So, I assume there is some oddball incompatibility with photo.net, my account and my MacOS.
Oh well.