BFException [0]: Secondary token mismatch

 Ah yes. This is when you open multiple tabs in the same browser. Say I have 5 tabs open. If I change something in one tab and go to the next tab and change something else. It prevents this. It's so that you can't take a URL that is already logged into Build Forge and copy that email it to someone else and allow them to access it and make changes. It's a security thing that occurs with more than one tab open when making edits to certain pages in Build Forge. 

 Hey, I would clear your browser cache and try again.

Hi,

Which version of Build Forge are we talking about?   (Lookina t other posts, this may be 8.0.0.2, is this correct?)
And do you see it in other browser vendors as well?