Partially working. I upgraded to 1.4.2 on a client site using 1.5.5f.

It works when paying via check/money order but not PayPal Express (selected on the payment page, not the shopping cart). I have not tried PayPal Payments Pro but that is the third payment option.

Shipping modules include:
Flat Rate
Free Shipping Options
Store PickUp
USPS

Order Total modules include:
ot_categoryorderfee
ot_coupon
ot_group_pricing
ot_insurance
ot_loworderfee
ot_manufacturer_discount
ot_reward_points (I did include the two changed per the instructions)
ot_reward_points_display
ot_shipping
ot_subtotal
ot_tax
ot_total

I know it's a lot. I can send the error log as well.