Hard to say rossb; depends on how you edited the assigns. iGame by default in the ClassicWB looks in the assign A-Games:, which can easily be edited from the Start/Settings menus like shown in the first video:
http://classicwb.abime.net/classicweb/tutorials.htm
You can also change where iGame looks for games in the program itself.
When you installed the ClassicWB pack, you should have been given the option of installing artwork. If you said yes, look in the System:Games drawer - it will contain screenshots and you need to copy them to the new partition location as shown in the tutorial vid.