Not sure if this should be reported in shipping or flat rate? I am using latest dev versions of both shipping and flat rate on commerce 1.4 & Drupal 7.20.
We have 4 shipping options set up, commerce UPS and 3 other flat rate options. I keep finding all shipping prices have disappeared on the review page after selecting - when shipping is either on the checkout pane or its own shipping pane, shipping line item not showing in the cart summary or lower down despite shipping service set to "Include this pane on the Review checkout pane." in a non collapsible pane.
I have "Calculate shipping rates via AJAX as addresses are updated on the checkout form." ticked and have the shipping on its own checkout pane. I have noticed that by moving the shipping to the previous pane and then back it does re-appear but not permanently. I thought it may be a permissions issue but there are no permissions to set on shipping from a view point.