After looking at the (ot_reward_points_display.php) it looks like the info is not getting inserted. It looks like it should have a sort order of 1000 and there is no sort order that is showing. Also the status light next to it stays red and no way to turn it green.
Last post for now, I promise

Ok I fixed the above problem in the Orders Total area. Although I did this before and it made no difference, I uninstalled the mods and then reinstalled them again and it worked this time.

Still the remaining problem of the error on the Checkout Payment page.