User receives error when trying to access queues in SCSM 2012. Also cannot edit activities.

Question

Hi,
I am trying to resolve an issue that a user has been struggling with in SCSM 2012 multiple times now. Everytime he tries to access a queue in the work items this error appears about 5 times:
Error Message:
Date: 7/29/2014 4:17:51 PM
Application: System Center Service Manager
Application Version: 7.5.2905.0
Severity: Error
Message: No matches were found for input string '$MPElement[Name='SMIncident!System.WorkItem.Incident.ProjectionType']$'. Cannot resolve ManagementElementReference.
: No matches were found for input string '$MPElement[Name='SMIncident!System.WorkItem.Incident.ProjectionType']$'. Cannot resolve ManagementElementReference.
After closing out all of the errors, the tasks panel no longer has any options.
Also, when this user opens an activity, there is a red box outlining the form. He is unable to click 'OK' or 'Apply' even though the activity is In Progress. This means he is unable to make any changes to activity forms. I logged on to the user's compluter
myself to see if this issue would just apply to him and I ended up with the same issues. This user experienced these issues before and switched to a new device where he no longer experienced these problems for a while. Now the issues have returned and I do
not know how to help him. We have not had this problem come up before.
Please help me understand what is causing these problems.
Thanks,
Nick

Answer 1

Thanks for getting back to me so quick!
You were correct to assume that I was referring to a View. All of our users have been added to a standard user role that providers that basic functionalities that they need. This particular user's access is exactly the same as the other users in his department,
yet he is the only one who has experienced this problem. All of the user roles that we have added this user to contain at least 10 other users who have not reported any issue like this.
I am wodering how this problem could only apply to this one user even after changing devices. I should also mention that with each of the devices that this user has worked on, there was a period of time when he was able to work in SCSM without
any issues. What could have changed that caused this error to arrise on two separate occasions for just one user? 
The biggest issue is the fact that he is unable to edit activities. Am I correct to assume that these two issues are connected?
I hope this message helps to clarify the problem we are experiencing.
Thanks,
Nick