I recently updated the program and imported a bunch of auctions from my watching list but the shipping prices aren't being listed in the myibay window. I'm using Vista

Any reasons for this or am i missing something?

If you don't see Shipping column at all, that maybe because it's not enabled. You can enable columns by clicking on View - Columns and selecting the column you want to see.

If you have Shipping column enabled, but it's empty..
Shipping prices are listed when sellers list it in the shipping fields as eBay requires.

If shipping fees are calculated by eBay or listed as "see description", then it will not be available in your list (considering as "unknown shipping price").

That's why shipping is not listed for all auctions. It's listed for auctions where it's available and displayed clearly on the auction's page only.