Good job on this forum and thanks for initiating it. I've noticed a couple of things (Windows 10, Chrome browser):
1. Navigation is quirky. E.G. in the top menu bar sometimes "Forums" button has a dropdown list, sometimes not, depending on what page is currently displayed. Regardless, if you click on the Forums button itself, you can get back to the Main Forums list. I would suggest adding an item to the Forums dropdown list for "Main Forums" because if you do click the dropdown arrow when it is visible, you then don't see an item for Main Forums. The Breadcrumbs menu seems quirky but I haven't figured out what is happening to try and explain it. It seems to not always "back you out" to where you think it will. I'll understand if you don't understand.
2. Many forums have a simple back button (not the browser back arrow) so when you get tunneled into a thread, you can back out easily. Something to consider.
3. When I joined today it seemed that "Watch" defaulted to everything. I was getting an email every time anyone posted in a thread I had posted in even though I did not turn on any Watches. I saw your basics vid, read everything I could find, finally found a way to turn Watch off everywhere. It was so buried, I can't figure out how to get back to it. I may be the only one affected by this, or maybe an info post about this somewhere obvious would be helpful to others.
Bottom line: I know these comments are somewhat vague but I was lost in the Nav much of the time and any notes about specifics were in vain. So, rather than try and identify what I've reported, maybe just keep an eye out for strange Nav happenings and I'll report again if I can nail it down.