Calendar just blank white square

[mickiete]

Went to use the calendar the other day and it only shows a blank white square. Never used to, it used to work.
I can't do anything while this is showing, I have to wait till windows says its not responding and have to click end task button.

Any ideas

PS: This pc is just running BI.

 

[wittaj]

You probably need to run maintenance or repair/regenerate DB. Once I do that, it is quick again.