Using system/password may not work at rel 6.x software as there was a specific sds/sds profile created for this "higher level access", but that access was not given to the system/password profile. At Rel 7.x, the default system/passsword profile has the sds checked off, so you can create other profiles with that same accesss.
I guess the question should be, "Are you using the default profile to log in or are you using one you have created?"
If you are using one that you created and have since deleted the default ones, you may be in a pickle!!! If this is the case, get Mitel Tech support involved. They may know of a way to get around the problem without defaulting the system and reprogramming. Otherwise, defaulting the system might be what you have to do inorder to get the access back!
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My Biggest problem is that I almost always believe what I tell myself.