PS CS4 Integration with iPhoto - Thumbnail Problem

I am using CS4 as my main editor in iPhoto. Setup in the iPhoto prefs. When I edit the photo (by pressing edit in iPhoto) and save it, the actual photo gets updated in iPhoto when you double click it..... However the thumbnail does not update.

I followed a tip on apple support but it didn't work, possibly because it was dated 2007.

The only way I can get it to update is by editing it first with CS4, saving it, then editing it slightly with iPhoto. Which doesn't got the bill.

Anyone else have this problem?

Problem fixed - a couple of reboots must have done the trick. It works tonight!