'You May also interested in' webpart is automatically deactivated every day

Hi guys.

I'm trying to activate this webpart on some pages. I'm able to activate it on the "edition" mode and everything works fine after I activated it.

But for some reason, the next day that I go to the page, the webpart is not activated. (that happen many times in the last week). So, I need to activate this every morning :S.

Any of you know why this is happening?