Method greyed out for one user

Hi,

I have a method that users can access from the item level to run a workflow.  One user can see the methods listed, but they are greyed out for him and he cannot run them from the worksheet.  I have checked his user security against others that are able to run the method and cannot see anything different.  I have had him log in on another machine and it is still greyed out, so it is not tied to his machine.

Suggestions?

Thanks,

Christina Howell