So I guess I can still read threads but they are not organized into the regions like we have on the web version. I will give it a week to see if it fixes itself otherwise, I'll just get rid of the app. Thanks for your help everyone.
That depends on which view you use within Tapatalk. At the bottom of the screen, tap on "Forums." Despite that misleading name (most of us would consider it all a single "forum"), that view would normally give you the same organized list of regional, national, etc., subfora that you get when you view the website. I say "normally" because when I viewed it through Tapatalk just now, using the "Forums" view returned the error message shown above and it wouldn't display anything. When I instead tap "Discussions," it displays fine, but I tend not to use that view because it doesn't really fit with how my mind sorts the threads. Each view within "Discussions" is in reverse chronological order (whatever thread within a given view has the most recent reply goes to the top), regardless of the subforum in which the thread appears.