Task Manager Greyed out on Staff Members Login

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Hi guys

 

Got a strange issue at the moment with some of our staff members

 

Task Manager seems to be greyed out on certain Staff members login and it works on others, they are all in the same OU and work in the same department so they all have identical user account permissions

 

All our staff members have roaming profiles except for when they log on to activeboard machines (this is in order to speed up logging times especially when lessons start)

 

So this is the dilemma we have at the moment

 

- One Staff member (Staff Member a) logs on to activeboard machine task manager is greyed out

- Second staff member (Member b) logs on to activeboard machine task manager is NOT greyed out and she can access it fine

 

We don't use Group policy to manage this

 

Any suggestions where to start or look?

 

I could try giving them new profile but i am actually trying to avoid that as they use a lot of specialist stuff so having to set everything up again on their roaming profile doable but will take quite a bit of work!