Changes in work not reflecting immediately on the page.

Hi Friends

While working on coreldrawX4 inspite of the changes i carry out, it does not reflect on the page immediately, i clicked into the next page just to check if something was wrong on all pages, and then when i came back to the previous page the changes was done. Now it has become a routine to switch between pages after every few seconds, as I am still unable to diagnose the cause. Few days back i tried to activate text bullets, i was unsuccessful, perhaps while trying to fix the issue, i might have accidentally checked or unchecked some box, which has caused the above behavior.

Please Help