recalculation not working
 

2 things keep happening to my excel.
1 - recalculation keeps getting set to manual - no matter how many times I
set it to automatic.
and 2 - I installed thge add-in of analysis tool pack which contains the
Mround function (I know I have ot get rid of my Mrounds and will) but ever
week or two the add-in needs to be reinstalled or else it deosnt work.

Any idea why these things keeps happening and how to fix ?
Thanks.
Yosef