Hi - Thanks for the reply!

Shipping:
Workflow-ng (version 5.x-2.0) - for shipping, regular is set up to just the default settings. Basically regular shipping for the site is free ($0). So when the shipping quote is fetched automatically in the checkout - it show up in the payment amount overtop of the taxes (wipes out the taxes). (just display...because in the checkout review they come back)

If you change the shipping to express the display is ok. Switch it back to regular and it overwrites the taxes again.

Checkout review: tax weight:
The GST & QST show up properly on the checkout...it's just on the review that hey get reversed.
In workflow-ng - GST is set at a weight of 1, it checks that the shipping country is canada and if true - adds gst.
QST is weight 2, it checks the shipping zone...if quebec it adds the tax.

Does that help at all?

I've just switched the site over to http://manifestdesign.qc.ca (although 2008.manifestdesign.qc.ca is still available)

Thanks for your help.