[whpalmer4]

If you use the Help->Send Feedback command to compose a message, it will offer to include a copy of your document (suitably altered to remove any sensitive information). If you then drag the attached document to the desktop, you could post it here and we could see if the problem is that you're doing something wrong.

It's hard to be sure without seeing your file, but my guess is that you've laid out your tasks, assigned the resources and then gone and changed the availability numbers, right? When you do that, you end up with over-allocated resources because the assignment includes the availability of the resource at the time the assignment was done. You can fix this by selecting all the tasks assigned to a resource, opening the Task: Assignments inspector, unchecking the Assigned Amount box and then using the Assignment toolbar button to do the assignment again with the current availability fraction.