Hello @mcarrion
Thank you for contacting the Canvas Community. We're sorry to hear you've been experiencing issues with item banks in new quizzes. Item banks that have been sent to the course and are used in quizzes should be under "this course" more specifically:
You can also select between viewing All Banks (question banks shared with the user, course, and institution), Institution Banks (question banks shared with your institution), and Banks Shared to this Course (question banks shared with the course).
If you have issues getting the item banks to load, we would likely need more specifics like which quiz, how do you import it or create it, etc. Additionally, you could contact Canvas Support directly to pinpoint the source of the issue and provide a resolution:
https://community.canvaslms.com/t5/Canvas-Basics-Guide/How-do-I-contact-Canvas-Support/ta-p/389767
Here is the Canvas guide:
https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-grade-a-quiz-in-New-Quizzes/ta-p/1068