Hi guys and girls

I've been given some footage to edit that needs to the whites colour balanced as they have a green tint to them at the moment.

I have fixed that by using the auto colour correction effect in Premiere pro and applied it to the full 44 minutes. However...I have noticed that the effect is flickering in and out. i.e. when I play it back the effect looks great for 10-15 seconds then it looks like the effect is removed and the green tint comes back for 3-4 seconds and then back to the colour corrected effect. This happens alot during the 444 minutes.

Has anybody else had this issue with Premiere Pro 5.5 using Windows 7.

Am I using the correct tool to "colour correct the whites"?