I have a user that is experiancing some issues with the essbase for excel
add-in, the problem is as follows

The add in is installed correctly and will work fine, but then the user
opens a new spreadsheet and the add-in will no longer be installed doesn't
happen all the time but enough for it to really annoy the user, closing down
excel and reopening it will bring the add-in back in most cases. I to have
had the add-in dissapear on occasion but nowhere near as frequently as this
user,

any suggestion would be appreciated