Activity Monitor not initializing

Having read with some interest about the activity monitor, I eagerly browsed into my apps\utilities folder and tried to fire it up. Not sure what I'm missing but it looks as if it's initializing and then just goes away.

I tried the fairly useless macrumors search and then google but didn't get any hits for my particular problem. The one thing I'm wondering about is a widget that I downloaded to monitor core temps - could it be interfering with the activity monitor?

Any help would be greatly appreciated.

 

Done but still no joy - any other ideas?

 

Not sure what I discovered here but I ctrl clicked the app and then looked through the package contents I then double clicked on the application monitor icon located in the mac os-x folder and got the following message in Terminal:

EDIT: Irritatingly - once again I have figured it out. I repaired permissions and it's working fine now. Can someone explain how the permissions get buggered up in the 1st place?