App Store Doesn't See Installed App

Hi Everyone,

I have the following hardware - iMac 2.66 Ghz Intel Core 2 8 GB Ram.

This computer is over three years old, so this summer, I reformatted the hard drive, then installed Mountain Lion - I am running OS X 10.8.2

I reinstalled all of my apps but have noticed the following problems. Any programs that I installed via the App Store, do not update themselves. In fact, they don't show as installed.

For example, I purchased Final Cut Pro X and Compressor 4. For the last two updates, FCPro X doesn't auto update. For today, I saw that FCPro 10.0.7 was out. I went to the App Store and clicked on updates, but it didn't show FCPro needing updating.

So, I went to Purchases, scrolled down, and saw that both Final Cut Pro X and Compressor 4 had "Install" highlighted - vs update. This happened a couple months ago when I had to update both of these programs.

I am going ahead and reinstalling FCProX, but would rather have a fix that just installs the updates.

Any ideas?

Thanks!

Marlo