1 Lots of your 'thumb' folders are empty.
2 The "big-sized" picture of teacup (the only thumb picture i can see) is referred as "img/portfolio/theaccident/tea.jpg", but the real file path is "img/portfolio/theaccident/Tea.jpg" (the capital letter matters)
So the problem is not in the scripts, It's in your export settings or your host defaults.
UPD:
3 Some links from your 'thumbless' pictures are pointing to correct 'big-sized' pictures (their first letters are not capitalized).
You definetely did something wrong when moving everything from desktop to host.