OMG. That's a hack, but it worked.
The code should automatically make all links have a data-scroll of 0. It took me three days of messing with this to figure out that you have to EXPLICITLY state on every link that data-scroll is 0. If you don't then it scrolls to a random location in the code. It would only scroll to the correct location on Tab 1. Otherwise all bets were off.
None of my external links worked properly until I did this.
At the very least, this should be in big bold letters in the documentation.This is the link format that made external links finally scroll to the correct location:
http://www.bishopodowd.org/dev/mctabs/demo1.php#tab3?data-scroll=0
http://www.bishopodowd.org/dev/mctabs/demo1.php#anchor3?data-scroll=0
Thanks Milo.