That shouldn't happen, but 'students' suggests a setup that is less than optimal.
By that I mean the ideal setup is a desktop computer running an Admin account with My Documents in it's default location, at least three internal hard drives with five preferred, and nothing stored on a network.
They are Admins and not on a network, we are a small school and don't have all of the hard drives and arrays.
Is My Documents in it's default install location?
You have only one hard drive in the machine?
I have seen issues when Adobe programs have to access files in the Desktop folder (it has certain properties, that "regular" folders do not), and in those cases, just using a regular folder has solved many of the issues.