Hi Nancy,
Sorry for the late reply, I don't usually visit this forum. In your Sharing Cart question, you do not *have* to add new roles. After using the Sharing Cart with a quiz in 1.9, log in as a student. If you cannot see the media (audio, video, images), then there may be a permissions problem. If you make a Question Viewer role for students or a Question Creator role for teachers, this may solve it.
In 2.2, this is generally not necessary because 2.2 solves the media link problem by embedding the media into each question. However, if you upgraded from 1.9 and created Legacy files expect problems. Moodle Docs and help warn against using Legacy files because it is not fully supported in upgrades and bugfixing. There is a long standing bug in the Moodle 2.x Import function that may affect you. The Sharing Cart using code from the standard Import function so beware. Properly embed the media into your questions in the 2.2 way and you won't have any issues.
Also remember that no user data is included with the Sharing Cart. Therefore, moving glossaries, wikis, and forums may be disappointing because the user data is the reason to move it. We are hoping in Sharing Cart 2.3 this fall, to include an option to move such activities with user data.
Cheers, Don
Don Hinkelman, Sapporo Gakuin University (send bug reports to hinkel at sgu.ac.jp)