Folders with Sub-folders show count as 0

All of a sudden.......in Lightroom 2.6 on Mac OS 10.6

in the Catalog window, under the Folders heading, image count is wrong for any folder that contains subfolders. It is not counting the images within the subfolders. When I open the main folder, to show the subfolders, it shows the correct image count for each subfolder.

For example, I have a main folder with 103 images: 3 of the images are not in a subfolder and there are two subfolders each with 50 images. The main folder shows that it contains 3 images. When I expand it, I see the two sub-folders each showing they contain 50 images.

AND if I click on the highest level folder, the grid doesn't show any of the images in the subfolders!

What is going on?? Suggestions??